I'm posting a little example that it may make it easier for you to understand. In all the cases the handlers are tangent to the curve (they always are, by definition) so it may look that everything is OK. But in the graphic on the top some curve points are in the curve itself where in the bottom ones there is no points in it. The results are the same but curves are likely to be smoother in the bottom examples because you will be using less points.
Using the right number of points (no more , no less) is also helpful in complex graphics. If you use to many points, you may have a memory problem and therefore your computer may take loads to render the graphic. So getting used to create graphics with the lowest number of points is a good practice. You don't need to become obsessed though :shifty:
Since I can approve my own pictures, you will see it immediately Aren't I cool flicks hair