Like how does Superman fly and how come he can come back from space without at least getting overly overly hot? How come in Superman going around the planet we don't see him ever bumping into space debris? How does one control a super heroes or villians power? If it is a villain then that is a lot of hate to practice that much to use correctly or do the auto matically know? Add questions if you like. Thank You in advance.
You can't really apply that kind of hard science to a fantasy medium. Superman is an alien powered by the sun, that's the entire explanation for his power set. The Flash doesn't burn calories to run fast, his abilities come from The Speed Force, basically an extra-dimensional energy field. Mutants literally have mutations that give them their abilities.
A lot of this sort of thing is just hand waved. Even Batman who is completely human and relies on physical training and technology, would dislocate his arms swinging around on grappling hooks.
I think for most people the interesting parts of comics are the character interactions and stories, not rigorous scientific explanation of how heat vision works.