This document discusses several free online tools that can help with search engine optimization (SEO) tasks like keyword research, website auditing, backlink analysis, and ensuring mobile friendliness. It provides brief descriptions of the main features and functions of tools like Google's Keyword Planner, Search Console, and Analytics, as well as third-party tools like Yoast SEO, SEMRush, Screaming Frog, and Ahrefs. The goal is to help users find the right free SEO tools to improve their website's visibility and performance.