If you know WPF or UWP the differences in Xaml between Xamarin Forms and those frameworks is something you could learn very rapidly. If you use Xamarin Android

If you know WPF or UWP the differences in Xaml between Xamarin Forms and those frameworks is something you could learn very rapidly. If you use Xamarin Android you get native access also and, for example, can import Java jar files in to your .Net code, so you can utilise stuff intended at the native level in Android. Similar for the iOS integration. Xamarin Forms gives you the mvvm and databinding you know from WPF etc. Maui builds on this and improved the overall offering.