It is fun and easy. Like with all work at home jobs there is a learning curve but it doesn’t take long to pick it up. Both eBay and Amazon allow you to sell items online to their huge audience.
Both are in the form of rebates or gift cards but it is a way to add money to your pocketbook all the same
If you are a creative person you can start selling your handmade items on a number of different sites and earn money to pay for the craft materials but also for the time and effort you put into them.
If you make your own curriculum or teaching resources you can sell those on Teachers Pay Teachers. I started doing this a year ago and have been happy with my results there.