Using Anchor Point Tool to change direction of Curve
When making curves with the Pen tool, I am not completely clear on when you want to press alt/option to click on a Handle point to change its direction. It seems that dragging out from the handle point changes how the curve is created, though is this something that can only be done with the Anchor Point Tool? Is there anything unique about what it is doing or is it just another way of creating curves with the Pen? If you do not use the Convert Anchor point tool, can you simply use the Direct Select Tool to adjust your points, handles, afterwards to come up with the same result?
Thanks in advance.

