I don’t mean to be rude but “selling things on craigslist” shouldn’t be on the list, I mean that’s like saying to get rich you can just sell all the expensive stuff you have laying around from being rich already. Maybe steal a bunch of bbq’s and sell them on craigslist might apply. Also I don’t see how “my cousin has a job” is a vaild way to make 100 really quick in a day… I have a job too, is that some secret trick, getting a job? a good way to make 100 a day is selling plasma and sperm for girls eggs can get you several 1000. or just find some people that look like they have money and scam them.
If you’ve got some free time and don’t live in the middle of nowhere, becoming a Lyft driver can be a very lucrative side hustle that allows you make money fast. And right now, they’ve got a promotion going on where any new driver will instantly get a $300 bonus after completing their 100th ride. If you start now and hustle hard on the weekends, you can probably unlock that bonus within a few weeks of driving (and that’s in addition to your normal earnings).