Revision 1
SEO

@namkyu · Sep 1, 2026, 8:13 AM
Added SEO fundamentals, workflow, tools, technical SEO, and FAQs.
+22,842−0
+SEO, or search engine optimization, is the process of improving a website so search engines can understand its content and users can discover it through organic search results.
+ 
+SEO can involve content creation, keyword research, internal linking, technical improvements, site architecture, page experience, backlinks, and monitoring search performance.
+ 
+Unlike paid advertising, SEO traffic does not require paying for every click. However, ranking improvements are not guaranteed and usually take time to appear.
+ 
+# Quick Facts
+ 
+ 
+| Item                       | Details                                                    |
+| -------------------------- | ---------------------------------------------------------- |
+| Full name                  | Search Engine Optimization                                 |
+| Main goal                  | Increase visibility in organic search                      |
+| Main search engine focus   | Google, plus other search engines                          |
+| Core areas                 | Content, on-page SEO, technical SEO, links, site structure |
+| Coding required            | Not always                                                 |
+| Free starting tools        | Google Search Console, Google Analytics                    |
+| Common paid tools          | Ahrefs, Semrush                                            |
+| Google Search Console cost | Free                                                       |
+| Results guaranteed         | No                                                         |
+| Typical result timing      | Changes can take weeks or longer to show                   |
+| Difficulty                 | Beginner to advanced                                       |
+ 
+ 
+# How SEO Works
+ 
+Search engines discover pages, process their content, and decide which results are useful for a particular search.
+ 
+For Google, this broadly involves:
+ 
+- Discovering URLs
+- Crawling pages
+- Rendering content
+- Indexing eligible pages
+- Matching pages to search queries
+- Ranking relevant results
+ 
+SEO helps make this process easier.
+ 
+A website can have excellent content but still struggle if search engines cannot crawl it, understand its structure, or determine which page should appear for a topic.
+ 
+# Main Areas of SEO
+ 
+## Keyword Research
+ 
+Keyword research identifies what people search for and what type of content they expect to find.
+ 
+Examples include:
+ 
+- "how to start a YouTube channel"
+- "best CRM for small business"
+- "video editing cost"
+- "how much does dropshipping cost"
+ 
+Useful keyword research looks at more than search volume.
+ 
+Consider:
+ 
+- Search intent
+- Competition
+- Business value
+- Topic relevance
+- Existing search results
+- Whether the site can realistically provide a better result
+ 
+A keyword with high search volume is not automatically useful.
+ 
+If the searcher's intent does not match the site's content or business model, the traffic may have little value.
+ 
+# Search Intent
+ 
+Search intent describes what the person is trying to accomplish.
+ 
+Common intent types include:
+ 
+- **Informational:** Learn something
+- **Navigational:** Find a specific website or brand
+- **Commercial:** Compare options before buying
+- **Transactional:** Complete a purchase or action
+ 
+For example:
+ 
+"what is SEO" is informational.
+ 
+"best SEO tools" has commercial intent.
+ 
+"Ahrefs pricing" is closer to transactional or navigational intent.
+ 
+The page format should match what users actually expect for the query.
+ 
+# On-Page SEO
+ 
+On-page SEO involves improving individual pages.
+ 
+Common elements include:
+ 
+- Page title
+- Main heading
+- Subheadings
+- URL
+- Main content
+- Internal links
+- Images
+- Alt text
+- Meta description
+- Structured information
+ 
+The goal is not to repeatedly insert a keyword.
+ 
+The page should clearly explain its topic and satisfy the user's reason for searching.
+ 
+# Titles
+ 
+A page title helps both users and search engines understand the page.
+ 
+Good titles are:
+ 
+- Specific
+- Descriptive
+- Relevant to the page
+- Different from other page titles on the same site
+ 
+Avoid creating dozens of pages with nearly identical titles.
+ 
+For example:
+ 
+Better:
+ 
+**How to Start a YouTube Channel**
+ 
+Less useful:
+ 
+**YouTube Guide Tips Information Online**
+ 
+# Headings
+ 
+Headings organize a page.
+ 
+A practical structure may include:
+ 
+- Page topic
+- Major sections
+- Supporting subsections
+ 
+Headings should help readers scan the article.
+ 
+Do not create heading levels only to insert keywords.
+ 
+# URLs
+ 
+URLs should generally be simple and understandable.
+ 
+For example:
+ 
+`/wiki/video-editing`
+ 
+is easier to interpret than a URL containing unnecessary IDs and parameters.
+ 
+Changing established URLs without a reason can create additional SEO work because redirects and links may need to be updated.
+ 
+# Content SEO
+ 
+Content is one of the main parts of SEO.
+ 
+Useful content should answer the searcher's question better than a page that exists only to target a keyword.
+ 
+Strong content may include:
+ 
+- Clear explanations
+- Original research
+- Real examples
+- Current numbers
+- First-hand experience
+- Useful tables
+- Step-by-step instructions
+- Sources
+- Images
+- Comparisons
+ 
+Avoid creating pages simply because a keyword exists.
+ 
+A site with hundreds of weak, overlapping pages can become difficult to maintain and navigate.
+ 
+# Content Freshness
+ 
+Not every article needs constant updating.
+ 
+However, information such as:
+ 
+- Prices
+- Software features
+- Laws
+- Platform rules
+- Statistics
+- Product specifications
+ 
+can become outdated.
+ 
+Review time-sensitive pages periodically and update information when necessary.
+ 
+# Internal Linking
+ 
+Internal links connect pages on the same website.
+ 
+They help:
+ 
+- Users discover related information
+- Search engines discover pages
+- Establish relationships between topics
+- Distribute navigation paths across the site
+ 
+For example:
+ 
+A page about **Video Editing** may link to:
+ 
+- Freelancing
+- YouTube
+- AI Video Creation
+- Content Creation
+ 
+Internal links should be relevant rather than added randomly.
+ 
+# Site Structure
+ 
+A clear site structure makes it easier to understand how content relates.
+ 
+A simple structure might be:
+ 
+Home → Category → Topic → Related Topic
+ 
+For a large knowledge site, categories and contextual links can help prevent pages from becoming isolated.
+ 
+Important pages should generally be reachable through normal internal links rather than only through the sitemap.
+ 
+# Crawling
+ 
+Before a search engine can index content, it normally needs to discover and crawl the URL.
+ 
+Pages can be discovered through:
+ 
+- Internal links
+- External links
+- Sitemaps
+- Previously known URLs
+ 
+A page with no links pointing to it may be harder to discover.
+ 
+# Indexing
+ 
+Indexing means the search engine has processed a page and may make it eligible to appear in search results.
+ 
+Being crawled does not guarantee being indexed.
+ 
+Being indexed also does not guarantee ranking for a particular keyword.
+ 
+Google Search Console can be used to check whether Google has indexed a specific URL.
+ 
+# Google Search Console
+ 
+Google Search Console is a free service for monitoring how a site appears in Google Search.
+ 
+It can help identify:
+ 
+- Indexed pages
+- Indexing problems
+- Search queries
+- Impressions
+- Clicks
+- Average position
+- External links
+- Sitemap status
+- Manual actions
+- Security issues
+ 
+Search Console is one of the first tools a new website should configure.
+ 
+A site does not need Search Console to appear in Google, but the service provides information that is difficult to obtain elsewhere.
+ 
+# Sitemaps
+ 
+A sitemap provides search engines with a list of URLs the site wants them to know about.
+ 
+XML is one of the most common formats.
+ 
+A sitemap is particularly useful for:
+ 
+- Large sites
+- New sites
+- Sites with many pages
+- Sites where some pages have limited internal links
+ 
+Google currently limits a single sitemap file to:
+ 
+- 50 MB uncompressed
+- 50,000 URLs
+ 
+Larger websites can use multiple sitemap files and a sitemap index.
+ 
+A sitemap does not guarantee that every URL will be indexed.
+ 
+# robots.txt
+ 
+A `robots.txt` file controls which URLs search engine crawlers are allowed to request.
+ 
+It is mainly a crawl-management tool.
+ 
+It should not be treated as the normal way to remove a page from Google Search.
+ 
+Google specifically states that if a page should not appear in search results, methods such as `noindex` or access protection should be used instead.
+ 
+# Canonical URLs
+ 
+The same or very similar content can sometimes be available through several URLs.
+ 
+A canonical URL indicates which version should be treated as the preferred version.
+ 
+Canonicalization can matter when:
+ 
+- URL parameters create duplicates
+- The same content appears in several locations
+- HTTP and HTTPS versions exist
+- Multiple domain variants exist
+ 
+Consistent internal linking and sitemap URLs can also help reinforce the preferred version.
+ 
+# Technical SEO
+ 
+Technical SEO focuses on whether search engines and users can properly access and use the website.
+ 
+Common areas include:
+ 
+- Crawling
+- Indexing
+- HTTPS
+- Redirects
+- Canonical URLs
+- Mobile compatibility
+- JavaScript rendering
+- Site speed
+- Structured data
+- HTTP status codes
+- Sitemaps
+- robots.txt
+ 
+Technical SEO becomes more important as a site grows.
+ 
+# Page Speed and Core Web Vitals
+ 
+Google's Core Web Vitals measure aspects of real-world page experience.
+ 
+The current primary metrics are:
+ 
+ 
+| Metric | Measures                   | Good threshold |
+| ------ | -------------------------- | --------------: |
+| LCP    | Loading performance        | ≤ 2.5 seconds  |
+| INP    | Interaction responsiveness | ≤ 200 ms       |
+| CLS    | Visual stability           | ≤ 0.1          |
+ 
+ 
+The thresholds are evaluated using the 75th percentile of page visits.
+ 
+Speed is not the only factor in SEO, but slow or unstable pages can create a poor user experience.
+ 
+# Mobile SEO
+ 
+Websites should work properly on mobile devices.
+ 
+Check:
+ 
+- Text size
+- Navigation
+- Buttons
+- Images
+- Layout
+- Forms
+- Page speed
+ 
+A desktop page that technically loads on a phone is not necessarily a good mobile experience.
+ 
+# Backlinks
+ 
+A backlink is a link from another website to your site.
+ 
+Links can help search engines discover pages and understand whether other sites consider a page useful.
+ 
+Useful backlinks may come from:
+ 
+- News coverage
+- Industry websites
+- Research citations
+- Partners
+- Useful resources
+- Organic references
+ 
+Avoid building a strategy around large volumes of artificial links.
+ 
+Google maintains spam policies covering manipulative link practices.
+ 
+# Link Earning
+ 
+One way to attract links is to publish material people have a reason to reference.
+ 
+Examples:
+ 
+- Original statistics
+- Calculators
+- Research
+- Industry datasets
+- Detailed tutorials
+- Free tools
+- Unique comparisons
+ 
+Useful resources can attract links naturally over time.
+ 
+# Structured Data
+ 
+Structured data provides machine-readable information about page content.
+ 
+Depending on the page, it can describe things such as:
+ 
+- Articles
+- Products
+- Organizations
+- Breadcrumbs
+- Events
+ 
+Supported structured data can make some pages eligible for enhanced search appearances.
+ 
+Adding structured data does not guarantee a rich result or higher ranking.
+ 
+# Images and SEO
+ 
+Images can also appear in search.
+ 
+Good practices include:
+ 
+- Descriptive file names
+- Appropriate alt text
+- Reasonable file sizes
+- Correct dimensions
+- Relevant surrounding text
+ 
+Avoid adding alt text purely to repeat keywords.
+ 
+Alt text should primarily describe the image when that information is useful.
+ 
+# SEO Tools
+ 
+SEO can be started without expensive software.
+ 
+## Google Search Console
+ 
+**Cost: Free**
+ 
+Useful for:
+ 
+- Search performance
+- Indexing
+- Sitemap submission
+- URL inspection
+- Link reports
+- Search issues
+ 
+This should usually be the first SEO tool connected to a website.
+ 
+## Google Analytics
+ 
+Google Analytics can show what users do after reaching the website.
+ 
+Useful information includes:
+ 
+- Visitors
+- Traffic sources
+- Landing pages
+- Engagement
+- Conversions
+ 
+Search Console and Analytics answer different questions.
+ 
+Search Console focuses on Google Search visibility.
+ 
+Analytics focuses more broadly on website usage.
+ 
+## Ahrefs
+ 
+Ahrefs provides:
+ 
+- Keyword research
+- Competitor research
+- Backlink analysis
+- Rank tracking
+- Site audits
+- Search traffic estimates
+ 
+Current published pricing includes:
+ 
+ 
+| Plan       | Current listed price                          |
+| ---------- | ---------------------------------------------: |
+| Free       | $0                                            |
+| Starter    | About $29/month in current help documentation |
+| Lite       | Higher paid tier                              |
+| Standard   | Higher paid tier                              |
+| Advanced   | Higher paid tier                              |
+| Enterprise | Highest tier                                  |
+ 
+ 
+Ahrefs also publishes regional pricing, so displayed prices can differ depending on currency and location.
+ 
+A beginner does not need Ahrefs to make a site eligible for search.
+ 
+Paid tools are primarily useful for research, competitive analysis, and scaling SEO work.
+ 
+## Semrush
+ 
+Semrush provides:
+ 
+- Keyword research
+- Competitor analysis
+- Rank tracking
+- Site audits
+- Backlink analysis
+- AI search visibility tracking
+ 
+Its current U.S. SEO plan starts at:
+ 
+- $139/month when paid monthly
+- $117.33/month equivalent when billed annually
+ 
+Semrush also provides a limited free tier.
+ 
+Paid tools should be purchased when their data saves enough time or improves decision-making enough to justify the cost.
+ 
+# Practical SEO Workflow
+ 
+## 1. Make Sure the Site Can Be Crawled
+ 
+Check:
+ 
+- Site loads correctly
+- HTTPS works
+- Important pages are not blocked
+- Internal links work
+- Pages return appropriate HTTP responses
+ 
+Technical problems can prevent content work from producing results.
+ 
+## 2. Set Up Search Console
+ 
+Verify site ownership and review:
+ 
+- Indexing
+- Search performance
+- Sitemap
+- Page issues
+ 
+New websites may have very little data at first.
+ 
+## 3. Create and Submit a Sitemap
+ 
+Generate a sitemap containing canonical pages that should appear in search.
+ 
+Submit it through Search Console.
+ 
+Do not include every possible internal URL if many should not appear in search.
+ 
+## 4. Research Topics
+ 
+Identify topics relevant to the website.
+ 
+Look at:
+ 
+- Search suggestions
+- Competitors
+- Search results
+- Customer questions
+- Forums
+- Existing site-search data
+- Keyword tools
+ 
+Build pages around useful topics rather than creating several nearly identical pages for every keyword variation.
+ 
+## 5. Inspect the Search Results
+ 
+Search the target query manually.
+ 
+Look at what currently ranks.
+ 
+Ask:
+ 
+- Are results tutorials?
+- Product pages?
+- Lists?
+- Videos?
+- Definitions?
+- Tools?
+ 
+The search results provide clues about search intent.
+ 
+## 6. Create the Best Useful Page You Can
+ 
+Include the information required to satisfy the query.
+ 
+This may involve:
+ 
+- Explanation
+- Examples
+- Steps
+- Prices
+- Comparisons
+- Sources
+- FAQs
+- Images
+- Tables
+ 
+Do not make an article longer simply because competitors have long articles.
+ 
+Length should come from useful information.
+ 
+## 7. Add Internal Links
+ 
+Connect the new page to relevant existing pages.
+ 
+Also update older pages when the new page is genuinely useful to their readers.
+ 
+This helps avoid isolated pages.
+ 
+## 8. Check Technical Details
+ 
+Before publishing, review:
+ 
+- Title
+- URL
+- Heading structure
+- Canonical
+- Indexing settings
+- Images
+- Internal links
+- Mobile layout
+- Page speed
+ 
+## 9. Publish and Wait for Data
+ 
+SEO results are not immediate.
+ 
+Google states that some changes can be reflected within hours while others can take several months, and recommends allowing several weeks before judging whether changes had a useful effect.
+ 
+Avoid rewriting pages every day because rankings have not changed immediately.
+ 
+## 10. Measure Performance
+ 
+Track:
+ 
+- Impressions
+- Clicks
+- Queries
+- Landing pages
+- Rankings
+- Conversions
+ 
+A page receiving impressions but few clicks may have a different problem from a page receiving no impressions.
+ 
+## 11. Improve Existing Pages
+ 
+SEO is not only publishing new articles.
+ 
+Existing content can be improved by:
+ 
+- Updating outdated facts
+- Expanding missing information
+- Improving structure
+- Fixing broken links
+- Adding internal links
+- Improving titles
+- Removing inaccurate information
+ 
+High-quality maintenance can be more valuable than continuously adding low-quality pages.
+ 
+# Common SEO Mistakes
+ 
+## Expecting Immediate Results
+ 
+SEO is not paid advertising.
+ 
+Search engines need time to discover, crawl, process, and reassess pages.
+ 
+## Keyword Stuffing
+ 
+Repeating the same keyword unnaturally does not make a page useful.
+ 
+Write for the reader while making the topic clear.
+ 
+## Creating Duplicate Pages
+ 
+Do not create many pages that answer essentially the same question just to target slight keyword variations.
+ 
+## Ignoring Search Intent
+ 
+A technically optimized page can still fail if it answers the wrong type of question.
+ 
+## Publishing Without Internal Links
+ 
+A page should be part of the site's information structure.
+ 
+## Buying Low-Quality Links
+ 
+Artificial link schemes can create spam-policy risks.
+ 
+## Blocking Important Pages
+ 
+Incorrect robots.txt, noindex, authentication, or canonical settings can prevent important pages from appearing as intended.
+ 
+## Ignoring Mobile
+ 
+A page should be usable on the devices visitors actually use.
+ 
+## Obsessing Over SEO Scores
+ 
+Third-party SEO scores are diagnostic tools.
+ 
+A score of 100 does not guarantee rankings.
+ 
+Focus on real search visibility, user usefulness, and technical accessibility.
+ 
+# Frequently Asked Questions
+ 
+## What does SEO mean?
+ 
+SEO stands for Search Engine Optimization.
+ 
+It refers to practices that help search engines understand a website and help users discover its content through organic search.
+ 
+## Is SEO free?
+ 
+SEO itself does not require paying a search engine for each organic click.
+ 
+However, producing content, development, tools, employees, consultants, and link-worthy resources can cost money.
+ 
+Google Search Console is free.
+ 
+## How long does SEO take?
+ 
+There is no universal timeframe.
+ 
+Google states that some changes may be reflected within hours while others can take several months.
+ 
+It generally recommends waiting several weeks before deciding whether changes produced a useful effect.
+ 
+## Can I guarantee a number-one Google ranking?
+ 
+No.
+ 
+Google explicitly states that there is no method that automatically ranks a site first.
+ 
+Search results depend on competition, relevance, quality, search intent, technical accessibility, and many other systems.
+ 
+## Do I need Ahrefs or Semrush?
+ 
+No.
+ 
+A website can perform SEO without either platform.
+ 
+Paid SEO tools make keyword research, backlink analysis, competitor analysis, rank tracking, and auditing easier at scale.
+ 
+## Is Google Search Console free?
+ 
+Yes.
+ 
+Google provides Search Console as a free service.
+ 
+## Do I need a sitemap?
+ 
+Not every small site technically requires one, because search engines can discover pages through links.
+ 
+However, sitemaps can help search engines discover URLs and are particularly useful for new or large sites.
+ 
+## Does submitting a sitemap guarantee indexing?
+ 
+No.
+ 
+A sitemap informs Google about URLs but does not guarantee that every page will be indexed.
+ 
+## Does robots.txt prevent a page from appearing in Google?
+ 
+Not reliably.
+ 
+Google states that robots.txt is primarily for controlling crawler access.
+ 
+Use appropriate indexing controls such as `noindex` when the goal is to prevent an eligible page from appearing in search.
+ 
+## What are backlinks?
+ 
+Backlinks are links from other websites to your website.
+ 
+They can help with discovery and may contribute to how search engines understand the importance and context of pages.
+ 
+## Is page speed important?
+ 
+Page speed affects user experience, and Google measures Core Web Vitals such as LCP, INP, and CLS.
+ 
+Speed should be improved alongside content quality and other technical considerations rather than treated as the only SEO factor.
+ 
+## Does AI-generated content rank?
+ 
+The method used to produce content is less important than whether the content is useful, accurate, original where appropriate, and complies with search-engine policies.
+ 
+Mass-producing low-value pages simply to target search traffic can create quality problems regardless of whether AI was used.
+ 
+## Is SEO only for Google?
+ 
+No.
+ 
+SEO principles can also apply to other search engines.
+ 
+Google receives significant attention because of its search-market importance and extensive public documentation.
+ 
+# Sources
+ 
+- [Google Search Central — SEO Starter Guide](https://developers.google.com/search/docs/fundamentals/seo-starter-guide) — Official Google introduction to SEO, search visibility, content, site organization, and common optimization practices.
+- [Google Search Central — Get Started with Search: A Developer's Guide](https://developers.google.com/search/docs/fundamentals/get-started-developers) — Official technical guidance for making websites accessible and understandable to Google Search.
+- [Google Search Console Help — About Search Console](https://support.google.com/webmasters/answer/9128668) — Official description of Search Console as a free service for monitoring search performance, crawling, indexing, links, and search issues.
+- [Google Search Central — Build and Submit a Sitemap](https://developers.google.com/search/docs/crawling-indexing/sitemaps/build-sitemap) — Official sitemap formats, submission guidance, canonical URL recommendations, and the 50 MB / 50,000 URL sitemap limits.
+- [Google Search Central — Introduction to robots.txt](https://developers.google.com/search/docs/crawling-indexing/robots/intro) — Official guidance explaining crawler controls and why robots.txt should not be used as the primary method for preventing Google indexing.
+- [Google Search Central — Crawling and Indexing](https://developers.google.com/search/docs/crawling-indexing) — Official documentation covering crawling, canonicalization, mobile sites, JavaScript, metadata, and indexing.
+- [web.dev — How the Core Web Vitals Thresholds Were Defined](https://web.dev/articles/defining-core-web-vitals-thresholds) — Official Core Web Vitals definitions and good thresholds for LCP, INP, and CLS.
+- [Ahrefs — Plans &amp; Pricing](https://ahrefs.com/pricing) — Current Ahrefs Free, Starter, Lite, Standard, Advanced, and Enterprise SEO tool pricing and feature limits.
+- [Ahrefs Help Center — About the Starter Plan](https://help.ahrefs.com/en/articles/9419051-about-ahrefs-starter-plan) — Current Starter plan limits and included SEO tools.
+- [Semrush — SEO &amp; AI Search Plans and Pricing](https://www.semrush.com/pricing/seo-ai-search/) — Current SEO plans, keyword tracking, site auditing, competitor analysis, and AI visibility pricing.