Video Tutorial Links :

Create a simple app using Xamarin :
https://bit.ly/2m27s2o

Create or generate APK file :
https://bit.ly/2k21YUC

Signin or Signup Form Page :
https://bit.ly/2lFj62P

Page Navigation (Next page, Previous page) with example :
https://bit.ly/2lwVf5v

How to use Piker (ComboBox or Dropdown) with example :
https://bit.ly/2lW45K9

Change ListView's default text color :
https://bit.ly/2lGny1h

Display alert message :
https://bit.ly/2lXjtpG

Xamarin installation in Visual Studio 2015 step by step :
https://bit.ly/2khOsMV