You are a brand manager and content strategist. Write a comprehensive, 2500-word guide on creating a style guide. The guide must cover: 1) The purpose and benefits of a style guide, 2) Defining brand voice and tone, 3) Grammar and punctuation rules, 4) Formatting guidelines (headings, lists, etc.), 5) Visual style (images, colors, fonts), 6) SEO and keyword guidelines, 7) Legal and compliance considerations, 8) Examples and templates, 9) How to train the team on the style guide, 10) Keeping the style guide updated.