There is no real shortcut - compression takes LOTS of practice and listening, and lots of trying different approaches to find the one that suits you personally.
The thing to remember is that compression has so many uses in mixing. It can be used to control dynamic range, to reshape the envelope of a sound, to tighten up and separate, to mash together and glue, to give movement to a sound, to brighten up, to dull down, to harden, to soften etc etc etc.
I recommend diving headfirst in and just using it and abusing it. Try every different method you hear about in turn.
You will make mistakes - some that won’t even become obvious to you for years - and you will over use it. But that is really the point. Use it, then listen - rinse and repeat. Some things that compression is doing will become so obfuscated in the heat of ear-fatigue that you will not recognize them until after a nights/weeks/months/years break, only to embarrassingly reveal themselves starkly in the cold light of the next listen.
No-one “gets” compression right the first time, but if you’re determined, you will get there.
Nevertheless, it doesn’t hurt to learn as much as you can about it. Here are a few landmark articles and resources that fed my personal “compression education”:
Finally, go to this podcast and navigate to Episode 36 “Compression 101”… no videos, just listening - the best way to learn about compression: