What are some ways people can make money quickly on the side?

Sell your blood to the blood bank. Sell your stuff on eBay. Save money by only drinking tap water if safe to do so. No milk ,juice , coffee , alcohol or pop. Eat more home cooked chicken and fish , buy less beef.

Prostitution. Working for an escort service.

There is no magic way. You have to see what’s open and what you can do, and that changes from neighborhood to neighborhood.

House painting. Practice on your own place. first so you get the idea. Then advertise.
There are always people who need to have a room or two or three painted.
Do it with a friend!

Garden maintenance and yard work. A gardener that I hire once a year to clear out weeds on the hill below my house is an immigrant who has done nothing but garden maintenance for homeowners has worked hard for many years and now owns 3 houses!
Oh, sorry, you said “quickly”. This did not happen quickly, but he has done very well for himself.

Research projects sometimes pay very well. For a female in her twenties, selling her eggs pays mighty well.

How honorable or legal do you want to be?

Do you have the personality and patience to sell Avon? I was never good with it, but I have had friends who did very well, including one guy.
I tried telemarketing. I felt guilty bugging people in their homes, but a guy in the room with me got sales like crazy.

The reliable fallbacks are always best. A trip to the hock shop or straight up crime.

I have been driving, and delivering for Uber, on the side. It’s not bad, and you can cash out immediately after driving, so you can get money fast. It beats the pawn shop….

I usually do waitressing for some quick cash. You need the right personality & have to not mind working hard. You’ll also need the right restaurant; but, you can make good cash in an 8 hour shift. I had one really good restaurant that the clientele tipped well. I didn’t want to work every day so we worked it out to where I filled in when he was short on wait staff & I could call up when I was short on cash & he’d work me into a shift or two.It’s not perfect for everyone; but, it did work well for me when my car insurance or homeowners insurance came due & my checking account didn’t agree.

Another thing I’ve been considering but haven’t found all the details on yet is being a Professional Cuddler. It pays around $60/hr & everybody involved has to agree that there will be NO sex involved. Since my husband passed & I’m NOT looking for another relationship, I find I miss the human touch. I think I would be good at it but as I said I don’t have enough of the particulars to jump right into it. So, this is one for you to check out to see IF it might interest you.

Thank you for all your replies! :) I’m trying to take classes for real-eatate education and it’s worth $2,000. I need the money soon.