Drawing with the Pen and Pencil Tools - Adobe Illustrator CC - page 185

Note
Pressing the Shift key when dragging constrains the direction lines to
multiples of 45°.
5. Click the next black anchor point to the right, and, pressing the Shift key, drag down to
the red dot. When the curve looks correct, release the mouse button and then release the
Shift key. Leave the path selected.
Now, you need the curve to switch directions. This time, the curve needs to create another
arch. You will split the direction lines to convert a smooth point to a corner point.
Tip
After you draw a path, you can also select single or multiple anchor points
and click the Convert Selected Anchor Points To Corner button ( ) or
Convert Selected Anchor Points To Smooth button ( ) in the Control panel.
6. Press the Alt (Windows) or Option (Mac OS) key, and position the pointer over either
the last anchor point created or the bottom direction point. When a convert-point icon
(caret) appears next to the Pen tool pointer ( ), click and drag a direction line up to
the gold dot. Release the mouse button, and then release the modifier key. If you do not
see the caret, you may create an additional loop.
Note
If you don't click exactly on the anchor point or the direction point at the end
of the direction line, a warning dialog box appears. Click OK, and try again.