But, yes, I learned everything working in theater. I learned the importance of community - I was constantly going to play readings, stand-up nights, improv. nights.
We have a full writers' room, and with something like 'MyMusic,' we've scripted it out with professional writers. There is some very basic improv from the actors, but everything is very to the letter, so it's easy to edit down to an episode. There are fun little things an actor might throw in there.
I got involved with an acting school and studied for a couple years. They used to have improv exercises that you would work on and you would do improvs.
If you're an actor, if you're not writing as well, or you're not going to improv classes, there are long spurts where you're not physically in production - unless you're Channing Tatum at this moment right now - where you need to be doing something.