Here's a good starting point
https://www.tutorialspoint.com/csharp/
You'll be learning C# from various different sources, whether they be guides, video tutorials, asking questions on stackoverflow, reading questions on stackoverflow or simply asking a friend.
You should be taking time learning the very basics before jumping ahead and wanting to try things like making games and screwing around with source projects, learning the basics and syntax of C# is very easy and fun and doesn't take very long.