What are the 4 types of SEO?

The 4 types of SEO are: (1) On-page SEO — optimizing content, headings, title tags, and keywords on each page; (2) Off-page SEO — building backlinks and authority outside your site; (3) Technical SEO — site speed, mobile-friendliness, crawlability, and indexation; and (4) Local SEO — Google Business Profile, citations, and Maps rankings.