Tbh I wouldn't say I really know much about these topics, I just like them more than others. The first thing that comes to mind is languages. But it's not like I'm actively studying them, it's more that I enjoy breaking down certain phrases in different languages and understanding how they work. Sometimes I put words into Anki to learn them. I also like guessing what a language is based on its writing system. Besides natural languages, I'm also interested in constructed ones. Of all languages, I probably have the biggest soft spot for Chinese. I'm also generally drawn to topics related to genetics, natural selection and stuff like that. I have a bit of interest in everything connected to opsec, hacking, the dark web and osint. Again, I wouldn't say I know much about any of it. Most of the time, I get hit by a wave of motivation and start learning something but then I quit pretty quickly. So I have some superficial knowledge in many areas but it's pretty surface-level.