SEO Basics — A Complete Guide to Search Engine Optimization
SEO (Search Engine Optimization) is the process of optimizing a website to increase its visibility in organic search results on Google and other search engines.
What is SEO?
Search Engine Optimization (SEO) is the process of optimizing a website to increase its visibility in organic (unpaid) search results on Google and other search engines.
In practice, SEO involves adapting your website to how search engine algorithms work — so that your site appears as high as possible for the queries your potential customers are searching for.
Why is this so important? Over 90% of Google traffic goes to pages on the first page of results. The page in position 1 receives an average of 27% of clicks, while position 5 gets only 6%. If your site is not in the TOP 10, it practically does not exist for most users.
The three pillars of SEO
Effective SEO is built on three foundations that must work together. Neglecting one limits the effectiveness of the others.
1. Technical SEO
Technical SEO is the foundation — if a search engine cannot properly index your site, even the best content will not be visible.
Key elements of technical SEO:
- Page speed — Google uses Core Web Vitals (LCP, INP, CLS) as ranking factors. A page should load in under 2.5 seconds (LCP)
- Mobile-friendliness — over 60% of searches come from mobile devices
- Indexability — proper robots.txt, sitemap.xml, and canonical tags
- Site architecture — clear URL structure and internal linking
- HTTPS — SSL certificate is a ranking factor
2. Content (On-page SEO)
Content is what search engines evaluate and what users consume. Great content answers user questions better than any competing page.
Key elements:
- Keyword research — understanding what your audience searches for
- Search intent — matching content to what users actually want
- Content quality — comprehensive, well-structured, and unique
- Title tags and meta descriptions — optimized for click-through rate
- Header structure — proper H1-H6 hierarchy
- Internal linking — connecting related content
3. Off-page SEO (Link building)
Off-page SEO is about building your site's authority through external signals, primarily backlinks.
Key elements:
- Backlink quality — links from authoritative, relevant sites
- Link diversity — links from various domains and content types
- Brand mentions — even unlinked mentions build authority
- Digital PR — earning media coverage and expert citations