Can't go wrong with these...
- 50 Split Testing Ideas (You Can Run Today!), Neil Patel
- Words on Words: 5 Books That Will Improve Your Writing, Gregory Ciotti
- How to Conduct a Content Audit for Quality and Audience Experience, CopyBlogger
- The Complete List of Evergreen Content Ideas for your blog, Buffer
- 29 B2B Growth Hacks – The ULTIMATE List, Startup Moon