My personal way of learning about any IDE/etc is when i see something interesting in the options/settings/shortcuts or if i accidentally do something odd i think "huh, what is that?" - i try it, and if i like what it does, i try to remember it for next time.

one at a time you build up an insane amount of muscle memory. you can't memorize all the things. it's also one of the reasons i use eclipse shortcuts in pycharms (don't want to rewire muscle memory)

edit: this is ~5 years in to pycharms and i still occasionally learn new things.