Lesson 1 of 3 published · 9 min · Updated 25 Sept 2026
How search engines work
Crawling, indexing and ranking explained.
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Learning objectives
- Explain crawling, indexing and ranking
Tutorial
Search engines discover pages by crawling links, store them in an index, and rank them by relevance and quality for each query.
Your job is to make pages easy to crawl, clearly about one topic, and genuinely helpful to the searcher.
Assignment
Search a topic you know well and note why the top three results deserve their positions.
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