Am I supposed to bridge any of the negative pads/pins with solder on the PCB? Some tutorials show all the solder connecting and I’m confused if I should do that or not.
Generally speaking, there is no need.
It will decrease resistance in the connection with the blade by a small amount, but if you care about that, then you should find a PCB with more pins, as that makes a much bigger difference.
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They are connected together internally in the PCB, if that helps you understand.