How long did it take you to fully understand c#

Answer 1

there is no fully
the first thing is you need to complete the course to learn the basics
then you play some challenges (dont mind win/lose)
and code those wrong answers to understand the tricky points.
then practice and practice, the coding challenges are good, (dont mind old/new), programs are to solve problems and so practice better have a problem to solve.
fourth stage is to create your own project. try making a game which interacts with user input~