You are just starting out and want to test the waters.
You have some writing experience, but no proofreading training.
Core Grammar Essentials
Business Grammar Essentials
Proofreading Power Basics
You might have a college degree.
You consider yourself a decent writer.
You might have some freelance or everyday proofreading experience, but not for paying clients.
Workplace Grammar & Style
You might have a college degree in English or journalism.
You might have worked in a writing or editing related job.
You want to seriously pursue proofreading or copyediting jobs or start a freelance career, but you need more credentials.
1. Core Grammar Essentials
2. Business Grammar Essentials
3. Workplace Grammar & Style
4. Beyond Basic Grammar
5. Proofreading Power