New to Breadboards: Connecting multiple things to the GND?

I'm really sorry if I sound stupid but I can't quite figure this out. I want to use a speaker and a Ultrasonic Range Finder in a project, and both use the GND. How to I connect multiple things to it, or any other pin (sorry if that;s not the right word) on the Arduino?

A row of holes in the breadboard are connected together therefore, anything plugged in one hole shares the signal with the other holes.

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