Our LINQ Resource Center at www.deitel.com/LINQ contains many links to additional information, including blogs by Microsoft LINQ team members, sample chapters, tutorials, videos, downloads, FAQs, forums, webcasts and other resource sites.

A useful tool for learning LINQ is LINQPad

http://www.linqpad.net

which allows you to execute and view the results of any C# or Visual Basic expression, including LINQ queries. It also supports the ADO.NET Entity Framework and LINQ to Entities.

This chapter is meant as an introduction to databases, the ADO.NET Entity Framework and LINQ to Entities. Microsoft’s Entity Framework site

https://msdn.microsoft.com/en-us/data/aa937723

provides lots of additional information on working with the ADO.NET Entity Framework and LINQ to Entities, including tutorials, videos and more.