I... don't like LINQ. I do all my data access in SQL, and present the data to .NET exactly the way it needs to be. (sigh)
But sometimes I need a LINQ reference. So... here is one from RedGate
https://www.simple-talk.com/dotnet/net-development/visual-lexicon-linq/>
Steve Erbach recommends: https://www.linqpad.net/ (see the comments below)