The last tool in the first row is called the Bezier tool. It allows you to create complex object quickly and simply. You can watch the tutorial above OR follow along below:
1) Select the Bezier Tool - 
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Also known as the Select and edit Paths or B on the keyboard shortcut.
2) Start by left clicking the mouse anywhere on the canvas.
3) This creates an 'anchor' point. Then go anywhere else on the canvas and left click the mouse again. This will create a line from the 'anchor point' to the new point.
The black solid dot is the starting point. The empty dot is now the new 'anchor'. Meaning any new lines drawn will be drawn from the empty dot to wherever you click next.
4) You can keep adding lines as much as you'd like. To connect all the lines together, go to the original starting point and hold down the shift key until you see an upside down U, then left click the mouse.
5) You can then turn this into a selection or a stroke path...
6) You can also curve the lines with the bezier tool. To do this simply hold down the left mouse button over any line (make sure you're between two points) and then drag it to curve it.
7) You can also use the handles on each point to further define your new path. Click and hold on either of the boxes to move them around.
8) You can create a wide variety of shapes, including the heart shape as shown below. Simply click out 4 lines in the shape of a diamond (connect them by holding the ctrl key and clicking on the last point).
9) Then click and drag out the straight lines to curve them in the shape of a heart. You can also use the handles to fine tune it as well.
10) You can then turn this into a selection from the properties box, or create a stroke path (meaning draw a border that matches the outline of your beizer selection). Once you do either, you can fill or paint it whatever color.
11) Remeber to turn of the selection (Select > None) when you are done with your selection.
12) You can also select edit and move to change your bezier path. However, once you turn it into a selection, you lose the path. Even ctrl-z or undo won't bring it back.
Up next, we'll cover some more tools including Zoom, Crop and Move...
