From PBS MediaShift:
The book publishing industry is going through a huge transition. It’s easier than ever to get a book out into the world. All the resources you need to publish a book are available you. You no longer need to go through the traditional gatekeepers (publishers) to publish a quality book.
Because it’s so easy to publish a book and get it out to market, authors sometimes skip the critical part of editing. No matter how good of a writer you are, you need to hire an editor. If a book has too many typos, readers typically stop reading. Not having an editor go through your work is like sending an untested drug out to market.
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A developmental editor will take your manuscript and work with the content itself. If needed, they might reshape your work and rearrange sentences to make the book flow together better. This type of editor helps an author find their voice and help refine their vision.
When looking for a developmental editor it’s important to choose one who has experience in your genre or specializes in your book topic. Don’t pick a travel editor for your romance book. If the editor has only edited magazine articles it might not make sense to have him or her do a developmental edit for your book. Working with an editor who you connect really well with is key.
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Copy editing is a crucial step in the publishing process. A copy editor goes through and catches spelling mistakes, adjusts for grammar, punctuation, capitalization and consistency. A copy editor will check your manuscript line by line to make sure your work is consistent and syntax error free.
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A proofreader makes a final check of the work before it gets published or goes live. They’ll catch any mistakes that a previous editor hasn’t caught yet: spelling mistakes, extra commas or spaces, and other minor errors.
Link to the rest at PBS MediaShift