Xamarin Best practices and code structuring

im new to Xamarin development and going to start some development on Xamarin.Andriod and Xamarin.iOS. as Xamarin.Andriod much same like Android and found lots of best practices,design patterns in Android area but my question more focued on exactly to Xmarin.Andriod and Xamarin.iOS.

straight to the point: im looking on some best practices and code arrangements in Xamarin.Android and Xamarin.iOS. something like how we can arrange the Xamarin.Android code base.

note: im looking on more into code arrangement and structuring with design patterns. not needed the Design patterns explanations.

Thanks in advance.