This guide aims to help developers choose the right authentication tool for their web applications by discussing various tools such as Clerk, Next.js Auth, Maze, Auth0, Supabase, Firebase Auth, SuperTokens, and Passport.js. These tools offer different features like user authentication, authorization, security enhancements, session management, integration with frontend frameworks, scalability, customization, ease of integration, and learning curve. The decision to pick up an authentication tool depends on the developer's needs, preferences, budget, and desired user experience.