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A low pass gate is from the "West Coast" synthesis style, and serves as sort of a combination filter and VCA. You can open the LPG in Plaits all the way, so drones are possible, or you can set the LPG to a short response (like a simple Decay envelope) for more percussive sounds if you want to send a gate/trigger to the Trig input. When you do this, both the amplitude and tone are affected with brighter frequencies more apparent at higher amplitudes, sort of like a filter opening in tandem with a VCA opening.
Plaits is cool because it combines this pseudo-filter/VCA behavior within the voice module itself so you aren't strictly limited to drones. It's fairly versatile with many different synthesis types and sounds, though with this being modular, nothing is all that fun without other modules. You will need something external to manipulate pitch: Keystep/Beatstep/SQ1/etc., so ultimately a single module in isolation still requires something else to operate.
A better solution to learn synthesis would be one of the more versatile semi-modular offerings like the Moog Mother 32 or Behringer Crave. They offer a single oscillator, filter, VCA, LFO, and sequencer in one patchable package that can be integrated later with a modular setup. To get much out of modular, one single module alone in a rack defeats the whole purpose of specialized modules, and is not really going to help you learn (or be very fun).
Have fun and good luck!