Convert between smooth points and corner points

Select the path you want to modify.
Select the Convert Point tool, or use the Pen tool and hold down Alt (Windows) or Option (Mac OS).
Note: To activate the Convert Point tool while the Direct Selection tool is selected, position the pointer over an anchor point, and press Ctrl+Alt (Windows) or Command+Option (Mac OS).
Position the Convert Point tool over the anchor point you want to convert, and do one of the following:
- To convert a corner point to a smooth point, drag away from the corner point to make direction lines appear.
  
  Dragging a direction point out of a corner point to create a smooth point
- To convert a smooth point to a corner point without direction lines, click the smooth point.
  
  Clicking a smooth point to create a corner point
- To convert a corner point without direction lines to a corner point with independent direction lines, first drag a direction point out of a corner point (making it a smooth point with direction lines). Release the mouse button only (don’t release any keys you may have pressed to activate the Convert Anchor Point tool), and then drag either direction point.
- To convert a smooth point to a corner point with independent direction lines, drag either direction point.
  
  Converting a smooth point to a corner point