Maybe it's stupid to ask this question:
Should I connect all ground wire together with multiple different voltage batteries?
Don't know if this is correct, I never connect batteries ground wire all together when I build such robots. I build a machine with 24V for motors and 12V for other sensors, light etc. Recently I keep hearing about ground wire should connected together in one machine. I am a bit confusing since I don't know much about electronics. Am I hearing the correct information? It won't cause any shortage, sparks or even burned?