Experiments with the polygon tool.
Polygon tool is not only useful when it comes to stars or triangles.
Then you remove - one point inside and one point outside. You'll have gear-like something. Then you select it's outside points and choose point type "Curve". And curve points have to be automatic in both directions:
You ave a flower. If you need something more industrial, create, say, 21-sized star and do like this:
It would take too long do describe all the applications you can use stars for. Experiment with it and you'll have good results. Here are just a few examples that can be done with the polygon tool: