How many types of SEO ?

Hello!!
There are many types of SEO in Digital marketing but mainly we have use :
1)On page SEO
2) Of page SEO

There are two types of search engine optimization: Onsite Optimization & Offsite Optimization

In Onsite SEO,You have to optimize meta tags,alt tag optimization,code optimization,internal linking,H1 tags,Bold tags,text optimization etc.

In Offsite SEO,You have to build links with high quality websites and submit links to directories,bookmarking,forum posting,article writing & submission,Press Release,classified Listing etc.

Basically, There are two types of seo :- <1> white hat seo <2> black hat seo.