That's it for a first short introduction!
The tutorial gave a quick introduction to LINQ and it's backing concepts.
However, we only scratched the surface in every discussed topic!
Where to go from here?
If you want to learn more about the concepts behind LINQ, check out the C# LINQ Background Topics playground.
If you want to get to know mor LINQ methods, check out the Using C# LINQ - A Practical Overview playground.