As you can see, knowing how to place tape to the bias is simple and will help you raise the quality of your creations. However, if you want to be a true professional, another thing you should know is to sew ribbon bias in corners.
To accomplish this, you must sew the tape normally, but, before you reach the corner, you have to bend the tape to create a diagonal. In it, the edge of the tape has to be aligned with that of the fabric.
Then fold the tape back again. You will see that there is a triangular-shaped tab left that you can lift and bend to the other side. When you have it bent, keep stitching and stop before you reach the margin of the seam in the corner.
Now, fold the tab back to the opposite side and do it again. Once you have the tape well-placed, all you have to do is finish stitching all over the edge of it.