I've explained about every single feature in the app on the GitHub wiki. It is the official documentation of the app and every page in the app has a Guide button at top where it takes you to the relevant GitHub wiki page.
Harden System Safely, Securely using Official Supported Microsoft methods and proper explanation | Always up-to-date and works with the latest build of Windows | Provides tools and Guides for Personal, Enterprise, Government and Military security levels
Use the Harden Windows Security app to secure your personal and enterprise devices against the majority of advanced threats. The app is suitable to be used by everyone.