Avoid commas, that are not necessary. If you reread your work, you will find on rereading that a great deal of repetition can be avoided by rereading and editing. Hyphenate between syllables and avoid un-necessary hyphens. It is incumbent upon us to eschew archaisms. One likely will not have needed the future perfect in one's entire life.
Unqualified superlatives are the worst of all.
Avoid all that colloquial stuff. If this were subjunctive, I'm in the wrong mood. Writing carefully, dangling participles must be avoided. Verbs has to agree with their subjects. Take the bull by the hand and avoid mixed metaphors.