I've begun to learn Assembly just for the hell of it, but what can I actually do with it? (That can't be done in a higher-level lang)
I already know a few langs. The lowest-level I know is some C/C++.
I already have some resources to learn, just more interested in the practical applicatoins of Assembly.
Programming microcontrollers
You can, but in real life they're mostly programmed in C
Write a compiler for higher-level languages :^)
Learn z80 asm. It's comfy as fuck.
Make a video game.
It's fun to learn assembly but to do real work you should stick to C/C++. The problem with assembly is that it's processor specific and inherently non-portable.
crackmes.de i do those as a hobby, it's pretty fun.
Make a rollercoaster building game :^)
Not much to do on regular computers apart from hobby projects (building an OS, etc.) AFAIK. It’ll be way more useful for embedded programming. Just find something to build.