We receive a lot of questions about the supplemental grammar textbooks we recommend on our General Proofreading: Theory and Practice syllabus and when it’s necessary to get them.
The main text I referenced while creating the course is The Chicago Manual of Style, 16th Edition (CMOS). In fact, all the practice worksheets and essays in the course are based off CMOS. Your success in the course is critical to having that style guide on hand. It will help you through those practice exercises AND give you some hands-on practice doing research at the same time. CMOS offers a FREE 30-day online trial, and after that, it’s only $39/year for the online version. It’s invaluable to your success not just in the course but in your general proofreading career!
The second resource I referenced was Merriam-Webster. You can access the dictionary for free online, or you can pay for the online yearly subscription to Merriam-Webster Unabridged as it also includes the Collegiate Dictionary and the Medical Dictionary. That subscription is $29.95/year.
I recommend other resources inside the course as well, but these two are the key resources no general proofreader should be without.
For more information on the General Proofreading course, check out the FREE 45-minute workshop.