Im trying to learn c#. What is the difference between those two?
Also where can I find any c# projects exercises? And should I learn the console coding first?
"What is the difference between those two?"
ReadKey - Reads only first key that user presses (no need to click enter)
ReadLine - Reads the whole line that user writes (needs to click enter)
"Also where can I find any c# projects exercises?"
Depends where you save it.
Default location:
C:\Users\YourName\Documents\Visual Studio 2017\Projects
"And should I learn the console coding first?"
yup
After you understand the basics switch to winform (Windows Forms)
It's not that hard