We have more detailed information regarding the following subjects:

• Getting Started
• Current Features
• Upcoming Features
• Performance Comparisons
• API Documentation
• Parser Options
• More Examples
• Form Submission by Example
• Migration Information
• Frequently Asked Questions

If you need some arguments for using AngleSharp (over similar libraries) then here we go:

• AngleSharp is totally standard-driven
• AngleSharp can also parse related content like CSS, SVG or MathML
• AngleSharp stands all HTML5-lib tests (i.e. it is a valid HTML5 parser)
• AngleSharp handles malformed HTML exactly as every modern browser
• AngleSharp contains brand new elements like support for the <template> tag
• AngleSharp performs at least as good as other libraries, mostly better
• AngleSharp provides very useful extension methods for DOM manipulation
• AngleSharp gives you a decoupled API that is easy to use
• AngleSharp is free of dependencies to other libraries
• AngleSharp can be used in cross-platform solutions
• AngleSharp can validate and submit forms
• AngleSharp is very easy to extend and customize

There are tons of other arguments. With the provided configuration abilities, and the given extensibility, AngleSharp can be used in various scenarios.