I've been really wanting to run a Superhero TTRPG lately, and I decided to use Mutants and Masterminds 3e because it seems like the simplest to use (Champions seemed a little too difficult for me).

However, I don't really understand how combat is supposed to work. I've read through the main book twice, and a couple parts are still fuzzy.

What exactly is Damage? Does every power automatically act as a Damage modifier? If so, what is the point of there specifically being a Damage power?

Also, the way combat is structured, it seems like it's possible to just instantly knock out the enemy if they roll poorly enough and you roll high enough. The lack of health is kinda worrying to me, how is combat made interesting then?