Rooting of Adb? confused about the concepts

Hi all, ultimately I'd like to experiment with a whole new os, but I gotta save up a little to buy a pixel. I'm currently working with a galaxy s21 ultra.

I never quite understood the reason to root and so I never really researched it. But now that I'm venturing more into the foss world and learning a bit more about tech, I'm realizing it might be useful for utilizing certain apps that require root and possibly helping to get rid of google and such services for good, but again idk the extent of what root offers and I also read it can be dangerous, so I'm lost to say the least.

My recent interest in rooting is purely because I have some foss apps that require root for me to use the full capabilities that I want. I also heard about adb and that it may be similiar to rooting but without actually rooting?

I'm just quite not sure how I should approach this and what things I should be aware of or NOT to do, to ensure I don't end up bricking the thing lol

Thanks for reading