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SEO Foundations
Lesson 2 of 16 Β· Introduction to SEO
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How Search Engines Work

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Alex · Monday, 3:30 PM
"Kate, the new intern, came over: 'Alex, why can't we find our site on Google? We launched it three weeks ago...'"

The answer is simple: the search engine doesn't know your site exists yet. Let's break down how Google actually finds pages.

Three Stages: Crawling → Indexing → Ranking

1. Crawling — Discovering Pages

Google runs automated bots called Googlebot. They follow links from known pages to discover new ones. If there are no external links to your site and you haven't submitted a sitemap — Googlebot may simply never reach you.

🧑‍💻
Alex
"Think of a spider crawling a web of links. It starts from big sites — news, Wikipedia — and works outward. If nobody links to you, the spider never finds you."

2. Indexing — Adding to the Database

Once found, the bot analyzes the page: text, headings, images, structure. Everything gets stored in the Google Index. If a page is in the index — it can at least be found.

⚠️ Being in the index ≠ being at the top. Billions of pages are indexed, but only ten appear on page 1.

3. Ranking — Determining Position

When someone searches, Google pulls matching pages from the index and ranks them. The algorithm considers 200+ factors: relevance, authority, speed, user behavior.

🧑‍💻
Alex
"SEO's job is to help at each of these three stages."
🎮 Test yourself: put the stages in the right order in the task!
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