Any resources I can actually trust?

I have never been involved in anything even kind of related to selling on Amazon, so I’m just getting started and have basically no info except for the basic steps to go through to start off.

I have been looking a lot on YouTube and other social media to see if I can find any helpful resources explaining ways to avoid mistakes, help things go smoothly, and any info that I maybe wouldn’t know already.

Everything I watch though ends up being some workshop or class I can purchase, with the same basic few tips before asking you to buy a class. Is there anywhere or anyone I can go to or anywhere that is an actually helpful step-by-step for beginners?