system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Did Steve practice hammer fighting?

In Endgame Steve picks up Mjolnir and is very capable with it right off the hop.  Did he know all along he was worthy and practiced hammer fighting just in case or is Steve just naturally that good and mimicked what he saw Thor doing?
gpt
Cap is a weapons expert, and would probably be versed in using blunt objects like the hammer as a weapon, and on top of that, I'd imagine spending so much time fighting alongside Thor has given him some unique insight on the hammer usage.  But the inscription on the hammer reads that whoever is worthy shall have the power of Thor, so another possibility is that the magic in Mjolnir imbued Steve with the ability to wield it effectively.