Have a friend doing dropshipping of real products. He mostly goes into amazon. Had a marketing background.

Key things if doing the real version of this.

1) In person supplier visits to vet them (yes, you need to fly to china

2) Amazon reviews are everything to these guys. So ad copy that is not too overblown (disappointment), amazing customer service etc. FBA.

3) Stick your own brand on the product and try to build that in a niche.

Lot's of seedy stuff also, but it does make really good money when its working for sure. These guys live in total fear of their accounts being banned / blacklisted (usually by competitors filing fake reports on them).