@Noglastiaa I used to read a lot of stuff on astrophysics and cosmology, but that was a long time ago. Hyperspace by Michiro Kaku was one of my favorites since he really boiled a lot of these high concept ideas down into something that was easy enough to understand (with a bit of math thrown in). I still get a kick out of exploring the concept of higher dimensions to reconcile the forces in our universe.
These days the things I like to discuss are...well, how to make things. I enjoy writing stories, drawing comics, and I enjoy discussing the process behind how I do those things and learn how other people do their work too. I guess, I'm more interested in the craftsmanship of how things get made.
Games, especially game development is another interest of mine. Traveling overseas and places to visit, and how folks travel interest me. Folks with different lifestyles and paths through life are fascinating (yeah, I suppose I just want to learn about people and how they live).
My taste in anime and manga is eclectic, I guess, so it's hard to find folks who enjoy talking about shoujo/josei shows. Those shows aren't as cool as AoT or One Punch Man.