Start Writing Fiction course through Futurelearn. Yes, I know I'd started writing already, but I certainly don't know everything about the subject - and the course is free.
So far I've learned that I'm a bit odd in that I haven't always either been a writer, or known that's what I wanted to do. (The picture is of me more than thirty years before I decided I might give writing stories a try)
I'm also very bad about using a notebook. Apparently I should carry one at all times and scribble in it almost constantly. When I expect to have time to write, I usually take my laptop with me. Even then though I rarely make observational type notes. Instead I get straight on with my next story, or add a bit to the novel.
Are you doing the course? Or any other courses? Do you carry a notebook at all times?