A Poet’s Ear: A Handbook of Meter and Form by Annie Finch is a detailed book about writing poetry along with examples of the different forms described. She has a website, too.
Ageing Backwards by Miranda Esmonde-White. The author explains a lot about using our muscles to do the exercises. What she recommends will help you get stronger, limber, and feel younger. She combines a lot of stretches and dance movements.
Clean, well-lighted sentences: A Guide to Avoiding the Most Common Errors in Grammar and Punctuation by Janis Bell. This book explains a lot of the rules in a comprehensive format that’s easy to read. Of course, practice is key to mastering everything Bell points out.