Today, I learned about the other shape tools, namely Polygon, Star, and Flare, and their different capabilities.
When drawing with Polygon Tool, the default shape it will create is a hexagon. To add or reduce the number of shapes, use the arrow keys. The same drawing functions of the rectangle tools are still applied to this tool.
When working the Star Tool, the same functions apply here as well, however, by holding Option, you can straighten the star.
When working with the Flare Tool, again, same functions apply here, but using arrow keys, you can change the reflection of the shape.