A good editor is worth their weight in gold. They not only fix your grammar and find and correct major and minor errors , but also improve your book's content and structure in a way that preserves your style. There are two main processes a manuscript has to go through prior to publication. Both require a systematic approach.
Use these as a guideline to edit and proofread your manuscript before sending it to an editor. Expect a red-lined manuscript back and learn from the experience.
Editing
This process concentrates on: Paragraph structure and clear transitions between paragraphs.There is a flow of the story - whether character development or plot. Highlighting any repetition of words, sentence structure, and the correct use of any technical, historical or factual elements. Helps to condense and improve the efficiency of your writing. Questions your flow of the narrative.

I 100% agree with printing it out! I love to be able to mark on the page and see things off the screen.
I’m curious about this tip: “TIP Read from last chapter to first.” Could you explain please?
Hi yes it is read from the last chapter to the first in essence reading it backwards chapter by chapter. That way you don’t get into the flow of the story. I hope that explains it 🙂