Check your lead paragraph and if it doesn't tell the reader your main idea and purpose, rewrite it. Avoid run-on sentences they are hard to read. Don't use no double negatives. Do not put statements in the negative form.
Verbs has to agree with their subjects.
No sentence fragments. Proofread carefully to see if you any words out. If any word is improper at the end of a sentence, a linking verb is. Steer clear of incorrect forms of verbs that have snuck in the language. Take the bull by the hand and avoid mixed metaphors.