Just between you and I, case is important. Never, ever use repetitive redundancies. Never use a long word when a diminutive one will do. One should never generalize. Place pronouns as close as possible, especially in long sentences, as of ten or more words, to their antecedents.
Prepositions are terrible words to end sentences with.
Proofread your writing to see if any words out and to avoid misteaks. Remember to never split an infinitive. Take the bull by the hand, and avoid mixing metaphors. The adverb always follows the verb. The passive voice is to be avoided.