Editing and proofreading is extremely important.
When we read a book, we like to be immersed within the story, even if it is non-fiction. However, if we come across a mistake or something does not read clearly, it brings us out of that moment and it can be difficult to return.
Editing and proofreading is the second most important part of the book-writing process. Bad editing will cause readers to stop reading and to give bad ratings.