In my understanding, the Pi 3B can be configured to use 14 GPIO pins as low/high outputs to turn on and off relay channels; so people suggest extension boards and things to drive all 16 channels of 16-channels relay boards.
However, in my case I only need to switch 10 channels of a 16 channels board. Do I assume correctly that I do not take any additional steps to get this working, just the relay board and a standard Pi 3B (and external 12V if I go for a 12V board). I just configure 10 pins as outputs, and that's it.
Correct?