/biz/ - Business & Finance

I don't get any of this shit? can I get a rundown and some links to info about this shit?
I mean what the fuck is a stock and a crypto. I'v hear about thees on the internet for awhile, and seen biz memes, but don't get it.
Main questions: what's the difference between stock and a crypto? Are you seriously telling me I can put in 100 bucks and get interest on it?
Like 100 in times 1 + rate increase and then sell and get that money?
if this is true why isn't everyone doing it? also it seems counter intuitive. If everyone was trying to make money everyone wouldn't make very much. Like how does this shit work?