Avoid cliches like the plague.

Be more or less specific.

Never generalize.

The passive voice is to be ignored.

Never ever be redundant.

Exaggeration is a billion times worse than understatement.

Make sure verbs agrees with their subjects.

Why use rhetorical questions?

Parenthetical remarks (however relevant) are (usually) unnecessary.

Proofread carefully to see if you any words out.

And don't start a sentence with a conjunction.