Unfortunately, a short answer is probably going to be wrong. Or at least make somebody unhappy (me or my client).
It seems like everyone - including the "experts" - have different ideas about what constitutes proofreading, light editing, copyediting...you get the idea.

This is why, when asked to quote a job, I usually say, "Well, it depends. What do you want?"
I"m not hedging. I'm trying to get it right - for all involved.
Below are links to some "definitive" descriptions about "general" proofreading and editing work. Keep in mind, these are general guidelines for "regular" copy. Typically, costs to edit industry-specific or very technical writing are double or even higher.
- A book editor's view from 2015
- An editors' forum tries to nail Jello to the wall...
- And what The Writing Center at UNC-Chapel Hill tells students about proofing and editing
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Would you like some help proofreading or editing your marketing copy, website, or other business communications? Let's talk. Let's get it right.