cough look at f10, f11 for example - you can also set 'break points' on lines of code, use f5 and the execution will stop when (hopefully when, not 'if') you get to a breakpoint ... you can then use various windows to inspect the content of variables to see what values they contain
This is a valuable skill, so learn up on it now :-) in the old days <sigh>, we had to write/dump our variable contents to the console window to debug - ie, you would insert
WriteLine("The value of x is {x}", x);
for example if you needed to see what 'x' contained after you'd modified it.