
There is a reason why you cannot edit your own book, even if you are an editor. This is because quality editing involves more than fixing spelling and grammar mistakes.
These days, there’s an AI for that.
Professional editors also help you to avoid plagiarism.

Plagiarism – to steal and pass off (the ideas or words of another) as one’s own : use (another’s production) without crediting the source; to commit literary theft: present as new and original an idea or product derived from an existing source.
Most people don’t purposefully copy others works. They do not intend to use another person’s ideas or words as their own.
But this is exactly what occurs without mentioning the source of your material.
You are in danger of plagiarism anytime you present an idea, words, or quotes you got from someone else without citing them.
Suppose your work becomes popular—what we all hope for—and someone discovers that you have purposefully or carelessly used their words without their consent or crediting them. In that case, you could be subject to legal action, ruining your image as a writer.
A professional editor protects against this by noting where a citation is needed in your work.
On social media, this frequently occurs and without repercussion. However, if you do this in your book and then publish it, you can suffer grave consequences.
Solutions

- Use end notes or footnotes to guide the reader to the back of the book, where you would have a notes section. In this notes section are your sources.
- Remember that some sources require you to get permission before you print them. If you cannot get permission, consider removing the source altogether.
- Also remember that nonfiction books intended to teach are not about personal opinion. It is about facts, proving and supporting those facts.
Just because self-publishing makes book publication quicker than traditional publishing, it does not absolve the self-publisher from the penalties associated with committing such literary violations.
Be sure to employ a qualified editor to prevent you from publishing a work rife with typographical, grammatical, and plagiarism errors.
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