Great Rules of Writing – by William Saffire:

“Do not put statements in the negative form.

And don’t start sentences with a conjunction.

If you reread your work, you will find on rereading that a great deal of repetition can be avoided by rereading and editing.

Never use a long word when a diminutive one will do.

Unqualified superlatives are the worst of all.

De-accession euphemisms.

If any word is improper at the end of a sentence, a linking verb is.

Avoid trendy locutions that sound flaky.

Last, but not least, avoid cliches like the plague.”