The document discusses style guides, including what they are, how to build one for a team or client, and how to ensure it is used. A style guide establishes consistency, reduces risks and costs, and helps communicate effectively. To build one, a team should start by looking at existing guides, selecting an approach, identifying topics, and writing and reviewing the guide. To ensure use, the guide should be included in training, kept manageable and available, and reviewed regularly with a process for changes.