Back Stitch
Back stitch is really simple stitch that is great for outlining shapes. I usually use it after satin stitch.
If you are right handed you will make your first stitch to the left and move your needle one stitch ahead and end touching the first stitch. Try to keep your stitches small and even especially on curves.
Zig Zag Back Stitch is done the same way but stitches are at an angle as you go.