how to learn c#

Question

I want to develop a windows application

Answer 1

There is a lesson here for you to learn
https://www.sololearn.com/Course/CSharp/?ref=app

Answer 2

Do the SoloLearn course
Do the codecademy course
Get visual studio and code small projects every day - simple calculator, a small random generator game, play around with arrays, loops etc

Once you have this covered, you'll know what to do next, probably learn a winform library