One important thing to keep in mind is that a work of literature is a living organism. If you change one thing, you almost always have to change something else to restore the balance. For instance, you might add a line or a sentence that includes a word that you repeat just below the new edit, in which case you might have to find a replacement for that word when you use it for the second time. But this principle can also exist on a larger scale, in the plot of a novel, for instance. You might add a scene at the beginning that then requires adjustments several chapters later, to make the action consistent. Until you get to the very last round of edits, it’s almost impossible to make one change without making another tweak somewhere else. But that's a good thing. It means that your piece of writing is alive, that it is reacting to the work you are doing in revising it.
Getting the Most from Your Writing Workshop: Part 1, Part 2, Part 3, Part 4, Part 5, Part 6
How to Get Published
How Not to Become a Literary Dropout
Putting Together a Book Manuscript
Working with a Writing Mentor
How to Deliver Your Message
Does the Muse Have a Cell Phone?
Why Write Poetry?
Poetic Forms: Introduction; The Sonnet, The Sestina, The Ghazal, The Tanka
How to Be an American Writer