where to place the + relative to - electrodes in differential mode?

I have a Ganglion with 8 header pins for 4 channels, such that there is one + and one - for differential mode.
I admit, I have trouble wrapping my head around the idea of measuring EEG data differentially rather than as the absolute voltage read in by the sensor, but I believe differential mode is supposed to be a best practice.
That being said, how do I know where to place - relative to where I place + for a given channel? I have 10/20 Brainnet headgear, which color code which holes on the right side of the head correspond to which holes on the left side of the head. Would I place the + on one side and the - in the corresponding positions on the other side? Or would that mean that I'm only reading data for one side of the brain?
If you could help turn my confusion into understanding then I'd be very greatful
I admit, I have trouble wrapping my head around the idea of measuring EEG data differentially rather than as the absolute voltage read in by the sensor, but I believe differential mode is supposed to be a best practice.
That being said, how do I know where to place - relative to where I place + for a given channel? I have 10/20 Brainnet headgear, which color code which holes on the right side of the head correspond to which holes on the left side of the head. Would I place the + on one side and the - in the corresponding positions on the other side? Or would that mean that I'm only reading data for one side of the brain?
If you could help turn my confusion into understanding then I'd be very greatful

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