It means you look at your writing with a "Fresh eye"-that is-seeing your writing in ways that will help you make effective choices throughout your essay
Accept that when writing, you often jump around from generating new ideas, writing them down, organizing them, revising them, and then returning back to writing.
Revision also entails revisiting new ideas. Actually, critically reviewing the content is the first step in revision, so don’t just focus on grammar and mechanical errors.