Want to really learn something?
Find something you care about and write about it. Don’t worry that you don’t know enough; be open and learn along the way. You can learn along with your readers, and they can help you understand things you might be missing.
When you discover a question, see if you can find the answer. Or an answer… or two.
I’ve found writing things down, to communicate them to other people, is about the best way to get the concepts clear in my own mind. It also helps me discover gaps in my own understanding which I can then fill.
It’s not even necessary for other people to read what you write, although their comments can help you figure some things out.
It may not guarantee you’ll get it right, but I’ll bet you’ll get closer that way than by just about any other way.