How to wire up a LED Matrix with a Raspberry PI

Question

I'm not sure how to wire up the LED Matrix corrctly. I followed the steps in this guide: https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/wiring.md In this tutorial the matrix has 3 GND pins. But in the wiring diagram below the GND is only connected with 1 pin (pin no. 6). Can I also use the pins 9 and 14 for the other GND or must all GND wires connected with the same pin?

Answer 1

All grounds are the same. They are all connected to each other internally. It does not matter if you use one or several. Do what is most convenient.