You can also sell books or make crafts or anything. I have a bunch of books I don't read and might donate.
Some of them are in good quality, while others have been smeared with a bunch of crayons, so you can easily get away with selling them for 5 dollars!
Depends on the book. How much are books anyways? 10 dollars seems overpriced, but I did see a book for 20 dollars. I wanted it soooo bad. 
I also have a bunch of free books from my old library that they were given away too. I don't know if any other library does that, but who knows? 
Try bookfinder.com to see what the same book is going for online (you just type in the isbn, and it will show you prices from various websites). In the used book world, condition is king! A book with crayon markings might not sell for enough to be worth it. Library discards are iffy; a lot of them are already in well-used condition or are out-of-date. You should decide on a cut-off value for whether or not a book is worth listing online. You can list similar books together in lots (like the same series or same author).
(I used to "flip" books in college for a bit of extra cash.)
Good condition toys will also sometimes sell, particularly if they are discontinued.
Making money during the pandemic is difficult because a lot of odd jobs require human interaction and everyone is trying to make an extra buck.
- There are websites for tutoring. You will need to check on their requirements because most will want you to be an adult. Many require some level of college education. There may also be tutoring centers in your area.
- Cans & bottles - $ depends on your state. Some states, like mine, don't pay enough to make it worth the effort.
- Used items can be sold on Ebay (make sure you have permission to sell them, so this won't cause friction in the family). Vintage (20+ years old) can be sold on Etsy. You'll want a kitchen or postal scale to figure out shipping costs.
- Lawn-mowing
- Pet-sitting
- House-sitting
- Babysitting - Don't babysit actual babies unless you are trained to do so. I'd stick to the ones that are potty-trained and have a sense of self-preservation, like maybe 4 and up. There may be demand for people to supervise kids doing online schoolwork.
- See if your parents or relatives will pay you for extra chores.
- Grocery shopping for older people
- If you are good at art and design, you can sell digital work like clip art, tutorials, etc.
- Jobs geared towards teenagers (after school care, camp counselors, VBS counselors, pool lifeguards...)
Disclaimers:
- In all cases, be sure to get your parent/guardian's permission for safety and legal reasons. Any sort of online selling will require an adult to be the legally responsible party.
- If you make $400 or more per year, you have to file taxes (US folks).
- Some money-making activities count as a business, which requires registration in your city/state and various other administrative details. Regulations vary by state, but this will generally include making items to sell and reselling (buying items specifically to sell vs. selling off a few old things you happen to already have).
- Be very careful about giving out information online.
- Don't ever back yourself into a corner. Whatever you do, where ever you go, you need an "out" in case whoever else is there turns out to be dangerous. A trusted adult should know where you are and when you should be back.