New guy looking into it

Hey all. Just looking into Amazon reselling (or anywhere else that is worth the effort)

Any one liner gems of advice? I’m aware it’s an incredibly late start. I’m just sick of being broke and at 37 I’m not overly interested in delving into university tuition etc as I’d be 40+ by the time I was starting out in any potential role…

Also. Why is stock from places like Aliexpress/Alibaba not allowed to be resold on Amazon?