Affilliate Marketing Help needed

Hello guys,

I'm totally new to this. and I have been doing fiverr, Upwork for last 3 years and wanted to make a passive income. Can you guys point me to some good threads/guides on

1. niche and keyword finding
2. affiliate site making
   
3. SEO guides and link building
4. and how to optimize sites for maximum conversion.

your help is much appreciated.