This document provides tips and best practices for building a Joomla 3 website correctly and avoiding common mistakes. It discusses planning the site structure properly using categories, tags, menus, and content. It recommends using Joomla's core features like versioning and ACL permissions. The document also suggests optimizing performance by caching, combining, and compressing files as well as securing the site, backups, and regular updates. Common extension recommendations and maintenance best practices are also provided.