When someone edits your work, there are three main changes they could make:

Rewording sentences that sound strange
Fixing typos
Fixing errors

Some editors only reference two changes – rewording and fixing errors. Not every mistake in an article is an error, in my opinion. At least, not an error due to you not understanding grammatical rules. Typos are a whole different breed.
I’m the queen of typos. I think it’s because my brain works so fast and my fingers are just trying to keep up. It’s why you see typos here occasionally (ok, I’m trying to be better about that!) and why I use …read more

I’m not known for my excellent grammar and spelling. Actually, more often than not, I just type too fast for my own good – and while I’m excellent at proofreading others’ work, I find it extremely difficult to spot my own mistakes. My problem isn’t, in general, not knowing the rules, but that doesn’t really matter. As a writer, mistakes can be fatal to a relationship with your clients, whether you knew the rule or not.
What drives me nuts, though, is the fact that many freelancers out there don’t seem to know the rules at all.
We all make mistakes, but …read more