1. The Content Edit developmental, substantive, or macro edit; sometimes simply called revisions. This is where the editor gives big-picture notes. Fiction: plot, characterization, scene crafting, POV’s, and all the other elements of your story. Non-fiction: logical flow of ideas, readability, strength of argument, interest level. The editor doesn’t actually edit your work in this stage, they usually give you a set of notes and send you back to work on your revisions.
2. The Line Edit. The editor works directly in your manuscript document, using Track Changes and Comments in Word. She suggests word, sentence and paragraph changes, looks for discrepancies, asks questions about things that don’t make sense, highlights inconsistencies or POV breaks, and looks for anything else that needs to be smoothed out. The line editor is responsible for seeing that the manuscript conforms to house style guidelines.
3. The Copy Edit. This is the most detailed editing, dealing with typos, spelling, punctuation, word use. Sometimes fact checking is done; permissions are checked; footnotes are verified.
Read more at: What Does a Book Edit Look Like? | Rachelle Gardner.