I am following this tutorial but when he import the references I get a lot more errors the he gets. https://youtu.be/NOquwAoYJtU look at 3:51 https://youtu.be/sJ1qknosM0I 
I am missing some important namespaces like RustPlugins and I dont have methods like Puts. What am I doing wrong?

You'd need to reference the Oxide DLLs that are downloadable from our site or our MyGet repo.

Thank you it works now