Beveling doubts

Hello, i’m a first year game design student, my professor taught me that I basically need to bevel EVERYTHING. But i still haven’t figured out how to bevel in a way that doesnt completely fuck up my topology. Is there particular areas that I should bevel first? Should i even bevel everything like I’ve been doing?

Plus, Whenever i try to bevel miltiple edges at the same time, it often doesnt let me do it, so I have to bevel fewer edges at once and it completely destroys my topology and makes doing UVs impossible, how do i fix this? I dont have a picture at the Moment but I can put an example in the commenta When I come back home. Thanks!