Okay, so 20 Editing Tips from Professional Writers is promo material for ProWritingAid, an "editing tool that highlights style issues and compares your writing to the best writers in your genre". It's even written by the founder Chris Banks and editor of the ProWritingAid blog, Lisa Lepki.
Does that mean it's all about flogging their site?
Yes, with almost every editing tip there's an explanation on how ProWritingAid identifies the issue so you can make the appropriate edits.
But what about those twenty editing tips?
Surprisingly, at least for me, they are all excellent advice and well worth the not-so-subtle sales pitch for their product. And as a bonus, each tip is presented in an easy to read info-graphic style and comes with examples.
I downloaded this e-book free using a link provided by BookBaby. https://cdn.prowritingaid.com/ebook/ProWritingAid_EBook.pdf,
If you prefer you can pay for it - it's worth it and less expensive than a subscription to their site.