Note that mine does not have the arrows/numbers on the side. Looks like a cutout from the middle section.
It only has golden circles on top. So far I'm used to using a prototype breadboard like this one:
I have an Particle Photon board. I assume i put it's pins from the other side but how do I than wire from there. For instance I have few other controllers which should all ground to the Particle Photon GND. How do I wire them to my GND pin ?