Guide for Micro Niche Sites :D

Hello everyone,
My name is Rony and I'm from Egypt, Last week I quitted my 9-5 Job as a WordPress developer and just started to look for a way to earn passive income every month. Interested to start with 1 micro nisch site then sacle everything month per month.
I want to learn more about some SEO Terms Like : PBN backlinks - Web 2.0 links ..... etc
Any recommudination for a course to watch online or where to start ?
Thx

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