So I work a FT job and am lately hearing about all of these terms such as "side hustle" and "passive income". I was wondering what some examples of these could be?

I plan on, at least at the moment to keep my day job, but would be interested in delving into some alternate forms of making extra money.

Does anyone here have any experience with these subjects? Are their more ways than just stocks or crypto to gain a form of passive income? What if I am limited currently to what I can and can not do?

Thank you.