Authority sites

Hey homies, hope your all making dat money. I am looking for a decent up to date Authority site course. Ive did some searching but a lot of what ive found is a bit outdated. I wana start a long term project in a niche i know everything about. In the hope it can start generating money at some point. I know most of this is going to be around SEO and content creation, which i am all fine with.

I just need something else to be growing while im doing this painfull CPA shiznit.