William Zinser, On Writing Well. No sentence fragments. It behooves us to avoid archaisms. Also, avoid awkward or affected alliteration. Don't use no double negatives.
Verbs has to agree with their subjects.
Avoid trendy locutions that sound flaky. Writing carefully, dangling participles should not be used. Never use a long word when a diminutive one will do. Proofread carefully to see if you any words out. Take the bull by the hand, and don't mix metaphors.