How much c# to learn and from where?

Hi GUys!
i'm beginner in programming.I started learning c# and my scope to use Unity3d for game development and that's why i'm learning c#.Can anyone help me how much do i learn it like basics or master it.
Please help me out and i firstly want to learn how to make 2d games or puzzle one.Let me knoow where to start off.

Thanks!