So much writing advice focuses on the actual writing -- there are many conversations about writing without editing, keeping your butt in the chair, about decisions made during the writing process. When that first, purely creative draft is done though... then it's time to edit.
Edits can change stories in massive ways. Teasing threads, embellishing plot lines, pulling everything tightly together. There are a slew of wonderful articles below, all written to help you find your best editing process and make that manuscript shine. Enjoy!