This document defines and discusses writing conventions, style, and register. It begins by defining writing as communicating ideas through sentences, and conventions as the standard rules of spelling, punctuation, grammar, and formatting. It then discusses the specific conventions of spelling, punctuation, capitalization, grammar, and paragraphing. Next, it covers the concepts of style, which refers to vocabulary choice, and register, which is the type of language used for a particular purpose. It provides examples of formal, informal, familiar, and ceremonial registers. The document concludes by listing references used.