This means that you have lesser control over your curves. Also, don't use too many - you only need one for each curve segment. Now, you can start to modify - i.e. to make curves of the straight lines. When you click on an anchor point, two little handles appear. If you pull the handles, they will change size and direction and shape a curve.
Long handles result in a flattened curve, and short ones in a sharper curve.
You can also turn the handles in the angle and direction you want them. Move The first thing you'll want to do is to move the splines to their correct position. By pressing Ctrl , you can drag and drop an anchor point anyway you like. The other important thing to do is to determine what splines are to be soft , and which are to be sharp or angled. By default the handles have equal length and create soft, wide curves.