There's different things depending on your taste.
- You can advertise on FIVERR.
- You can find forums/chats and do consultancy (just negotiate fees first).
- You can do remote support with other apps similar to TeamViewer.
- You can do writing (translation or re-wording).
- You can trade Forex.
To name a few. There are probably a lot of other things you can do, and while places like FIVERR are great - it takes time to build rep so persons will call on you.
Knowing the solution doesn't mean knowing the method. Yet answering correctly and regurgitation are considered "learning" and "knowledge".