Always be more or less precise. Sedulously eschew obfuscatory hyperverbosity or prolixity. Avoid pointless repetition, and don't repeat yourself unnecessarily. Don't use no double negatives. Don't never use no triple negatives.
All generalizations are bad.
Take care that your verb and subject is in agreement. A preposition is a bad thing to end a sentence with. Don't use commas, which aren't necessary. Avoid overuse of 'quotation' marks. Writing carefully, dangling participles must be avoided.