Philosophy and some sciences, but I’m not very knowledgeable. I know people say you don’t need to be an expert in order to enjoy things, and I agree, but then those aren’t special interests either, right? I love my music, but I know few bands. I love singing, but I lack technique. I like horror stuff, but I’m pretty picky. I’d like to be fit and practice sports, but my health is an issue. I like some beauty topics, but I’m not interested in applying them. I enjoy eating, simple food though. Some games are fun, but I mostly repeat the same ones. I like mountains and forests, but just for a day or two. I’d like to read more…
I’m really a master of none.
Practicing critical thinking.
Many here have already recommended reading and, particularly, reading philosophy. That’s a great way to practice critical thinking and to practice thinking outside of our comfortable or familiar ways. I’d add not to skip reading about logical fallacies and cognitive biases.
Many good things come from being a little cautious with apparent knowledge. To keep a reasonable doubt is also to keep our curiosity going, to keep asking questions, to imagine different ways, to discover new things, to avoid stagnant beliefs, etc. Critical thinking makes us not only less gullible but also flexible. This is valuable to understand everything, including one another, and perhaps in doing so, giving us better relationships and better societies.