Hi Samantha,

Thank you for your inquiry. I would have to say that I focus primarily on grammar, punctuation and phrasing. 

One of the most common grammar errors that I correct is agreement between different parts of a sentence. People tend to want to use "their" when referring to singular individuals, which is quite common in spoken English but very sloppy in written text. Subject/verb agreement is another common grammar issue that I fix.

The most common punctuation error that I correct is misplaced commas. Many people are not familiar with proper comma usage and tend to use too many commas or put them in the wrong places.

When it comes to phrasing, I reduce wordiness and fix awkward phrasing. Simple, clear sentences are much better at conveying meaning than long, convoluted ones. 

In addition to those three areas, I also try to make sure that the author's ideas flow in a logical fashion. This is not as frequent an issue as the others, but when it comes up, it is quite important.

I hope that this answers your question, and I would welcome the opportunity to help you out by editing some of your work.

Regards,
TWS