The molex wire connectors are built into the pucks. So, for a simple series circuit, what you would need is the driver, 2 wago wire connectors, and the 2 pucks.
You would wire the positive lead on the driver to a wago, and then from the wago to the positive terminal on the molex connector of the first puck.
then you would wire from the negative terminal on that puck, to the positive terminal on the 2nd puck.
then you would wire from the negative terminal on the 2nd puck, to a wago, which would connect to the negative lead from the driver, closing the circuit.
i watched this video and growmau5's other videos about 3-4 times each before i fully understood a lot of these concepts. i had no real understanding of circuits or electricity when i started my DIY lights. there are no stupid questions. just keep doing your research and it will click.