ground body at the beginning is very important
instead of new body. body lives inside a component.
is like a folder containing body, sketches etc.
pros: circular pattern - move one sphere in the component - all spheres will be updated
to seperate each sphere again - Component 1:1 right click - isolate
inside each component you can create sketches only belongs to that sketch
how to activate/de-activate component - the circle to the right of the component name
difference between component and assembly: when you have 2+ components inside a component it becomes an assembly