Amazon Niche Research ideas

Anyone here who can give me the thread url to amazon niche research guide. I am unable to find one on BHW.

Moderators please move or remove this thread if it does not fix in this forum

https://www.blackhatworld.com/seo/guide-money-making-website-building-keyword-research-domain-name-choosing-part-1.1181933/

This applies to all money making websites including Amazon. If you scroll down there are even more useful threads