You learn the most from sitting down and doing the work, regularly, patiently, sometimes in hope, sometimes despairingly. When you have something that seems complete, show your work to people you trust to be honest but not malicious. Put it aside for six months and reread it. Expect to be disgusted by your own early work. If writing is your vocation, if you hope that it might be your salvation, push on through the disgust until you find one true sentence, a few words that say more than you expected, something you didn’t know until you set it down.