Fluent Assertions offers a comprehensive suite of extension methods that enable developers to naturally express the expected outcomes of TDD (Test-Driven Development) or BDD (Behavior-Driven Development) unit tests. By providing a more readable and intuitive approach to writing assertions, it streamlines the testing process and improves code clarity. It supports a wide range of .NET platforms, including .NET Framework 4.7, .NET Core 2.1, 3.0, and 6, as well as .NET Standard 2.0 and 2.1, ensuring compatibility across various modern development environments.