Is Xamarin good for mobile app development

Welcome to SoloLearn forum! Current Streak 42 🚨 Problematic Situation 🚨 Is it helpful to takes notes while learning programming? Why is null instanceof Object false? Is it important for the programmer to have a degree related to Is it a good idea to learn Multiple Languages simultaneously? what will the unique idea to call time and date in php from database Should I do php after html or should I do css after html. Should challenge answers be explained ?