To start I’m actually a beginner with this.
I created an pretty basic PCB board.
At first I have 12 female headers connected to 12 leds. This is used to connect a wire from my Arduino Uno to my PCB so I can control every led. Then to cathode side of the led a 220 ohm resistor.
The resistor is connected to a header wich will be connected to the ground. (just for exploring this programm)
But I want to use a common ground, so I can connect 1 wire to the ground of my Arduino and all of the resistors are connected to the ground.
I guess I need to use a ground layer (i don`t know how to do that with this programm.)
Can anyone help me out?