If you just want to be a writer, I don't care, for pitching, for writing dialogue, you should take an improvisation class. It's super important.
The good thing about being a writer is that you don't need anything except for a laptop. You can really do your own work and if you're not manically compelled to write all the time before you do it professionally, it's probably not a business for you anyway.
Writing studio movies is the best job in the world... it's awesome.
Don't write something that is your passion project because all it will do is get the passion stomped out of you.
Books are great for if you want to work on the craft of writing for yourself, or, you know, to write novels or indie films, stuff like that.
I never thought I would write the way that I write for the studios now, which is like, not little novels, but be someone who literally is more like, you know, sometimes I guess we describe, we're more Salieri than Mozart.
Who is writing these screenwriting books? Not actually writing for the studios in Hollywood. These are people that have one or a half of a credit on maybe one movie, or none. So they're all theoretical.