system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] How is Captain America able to damage Iron Man?

This has been bothering me endlessly,obviously in civil war stories in the MCU and the regular comics.

 I know that Cap having ALL of his attributes at peak performance (Faster than the strongest man should be etc). But how in the hell is he able to stagger and let alone damage Iron Man? This is Iron Man who can shrug off tank shell, why is he being rocked by a very strong human with a hard shield?

Also bonus, in the civil war movie how was he able to overpower spiderman by pulling him over with that webbing? SPIDERMAN the guy who even at 15 should be able to lift around 7 tons, and stick himself to any surface, literally got overpowered off balance by a 210 pound man.

Something aint right here.
gpt
The MCU is not exactly the same as any of the comic universes - MCU  Cap is superhuman.  He is able to throw a motorcycle, knock a truck back by kicking it, and fall hundreds of feet uninjured.

He's also a skilled combatant, able to pull his opponent of balance and strike in vulnerable spots.  Parker is an unskilled kid with no fighting expertise. He only relies on his powers to win, and Cap can exploit  that pretty easily.