Finding projects to apply your knowledge?

For what purpose? Education or generating revenue?

Talk to people you want to help. And who will tell you all about their problems, of which you can help solve.

Three items to check off

1. Talk to ppl you like. Do you like filmmakers? Youtubers? Yogis? Coaches? Sports Stars?
2. Find folks who will actually tell you what they need help with.
3. And make sure you can help them. Can you build software for them in a timely manner?

That is a question that is more common than what people think. Not exactly finding project ideas, but not the "everywhere" todo apps.
I thought about it and wrote an article recently, with examples about what might those ideas be:
12 Ideas for Programming Projects Too Dangerous Not to Build

Take a look and see if you find anything that serves your purposes :)