Most starting developers always ask if there is a quicker method to commenting out a piece of code, than having to select the Comment Selection from the Edit menu.
There is in fact a keyboard combination, even if it requires the sequential performance of two keyboard shortcuts.
In order to comment out a selection, first select the piece of code you wish to comment out and then, tap on CTRL+K, followed by CTRL+C.
In order to un-comment a selection, select the piece of code that you wish to un-comment and then, tap on CTRL+K, followed by CTRL+U.