I finally figured out the trick and I wanted to share it with you.
Read moreHow To Use Photoshop Brush on ONE Layer at a Time + My Free Brush
Illustrator Shape Builder Tool in ONE MINUTE
It's pretty amazing what you can create by adding and subtracting shapes. Just take Twitter for example - the entire logo is made up of circles. The shape building tool in Illustrator makes combining shapes effortless. Hopefully this video helps you understand it!