At some point in your mobile development career, you are going to need to deal with data. Dealing with data means more than processing and displaying information to the end user. You are going to need to store this information somewhere and be able to get at it easily. Thanks to Xamarin and open source software, you can easily store your data with an industry tested platform, SQLite.
Source files for the Tuts+ tutorial: An Introduction to Xamarin.Forms and SQLite
Read this tutorial on Tuts+