Then write the functions Add, Subtract, Mulitiply, Divide to implement those operations. Remove the Hello World line and replace it with var sum = Add(2,2) If you are using Visual Studio as an editor for Unity, open it up from the start menu and create a new Console app. Once you learn enough solutions, you'll find that more and more often when you get "stuck", it takes less time to figure out your own solution than to ask other people for help. Other people might have solved it already and can show you. It's better to get as far as you can, then if you get stuck start asking questions.
If you wait to start programming until you've studied every problem, you will die before you're even 10% complete. You memorize how to do something simple, then see how to do something a little more complex with the simple process, then later start figuring out how to do more complex things on your own. Then triple-digit addition just added a digit. But you didn't have to memorize every result of every double-digit number: instead you learned how to use the single-digit table to follow a process to solve double-digit problems. You had to memorize how to do addition through the single-digit tables. You learn a small bag of maybe a dozen tricks for solving small problems, then the rest is about learning how to break big problems into small problems those tricks can solve. That's why people say you don't memorize code. If that was a ham sandwich, did you need to get a new lesson just for a turkey sandwich? Or a PB&J? If I told you what's on a croque monsieur and that the bread was toasted, would you still need a 20 minute video? They put the bread on a plate, put some stuff on it, and it was done. You probably had someone show you one time.
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