This book guides readers through the fundamentals of .NET MAUI cross-platform application development. It begins by exploring the concept of cross-platform development and introduces .NET MAUI, highlighting its evolution from Xamarin.Forms. The book then covers essential topics such as setting up the development environment, learning C# programming fundamentals, and mastering XAML for defining the user interface, including data binding. Through a series of practical projects, including a Color Picker, Tip Calculator, BMI Calculator, Unit Converter, and Weather App, readers gain hands-on experience in applying .NET MAUI concepts to build real-world mobile applications.