How can learn c# quickly?

Answer 1

http://rbwhitaker.wikidot.com/c-sharp-tutorials

Answer 2

There is no such thing as learning "quickly". It depends on how much you are able to cope up with the new things you learn. If you really want to learn, stop thinking about the time it's going to take. Just start with course and follow along. This would be a good start
https://www.sololearn.com/Course/CSharp/?ref=app