In A Web Based Sales Management Training Course,can Anyone Help Me?

Q: A client has asked me incorporate information about common grammar/writing problems and examples in a web based sales management training course that I'm developing. Since I ain't too sure that I knows lots about the subject meself. I'm hoping that there is some "Top 10 Mistakes and How to Avoid Them" information that you could point me to, or send me. Of course, I'll cite the source of any material that I use and/or embed a link to any appropriate resources.

A: Try Common Errors in English http://www.wsu.edu:8080/~brians/errors/errors.html