One of my online students feels she's lacking in the basics and asked me which books I recommended she read.
Here's my short list:
Elements of Style by Strunk and White
Spunk & Bite by Art Plotnik, a great follow-up to Elements
Woe is I and Words Fail Me by Patricia O'Connor
And if you're interested in writing fiction, Writing Fiction by Janet Burroway and Ron Carlson's Ron Carlson Writes a Story would make for a great beginning.
What are your recommendations?