Word order is important in communicating meaning in English. Parallel ideas should be expressed in parallel form. Formal written language avoids sentence fragments, run-on sentences, excessive coordination, and faulty subordination. Formal written sentences should be free of misplaced modifiers and dangling participles. Formal written sentences should have consistency in verb tense, pronoun agreement, clear pronoun reference, appropriate adjectives and adverbs, and agreement of subject and verb.
Punctuation marks clarify the message in the written sentence.
An appropriate word suits the purpose, audience, and situation. A word is a representation. A good word is as specific as possible. Words can be concrete or abstract. Words can have connotative as well as denotative value.