25 habits that will make you a writer by Shaunta Grimes — ignore the terribly clickbait-y title, the advice is actually pretty good. A lot of it may come off as pretty obvious (write every day), but I think it’s still worth a read, and includes some links to some other good books and resources. (Also, pretty relevant regardless of whether your chosen medium is writing or painting or sculpting, or any number of other creative outlets.)