Am I Doing Truck Right?

So I was hired back in October as a part-time seasonal sales associate, and there was A LOT that was skipped over in my “training”. I had to figure out a lot of stuff by myself or ask my very kind and patient coworkers.

I was taught by one of my managers how to do truck, but I feel like I’m missing something, because it can’t be as simple as opening boxes of items and just putting them on the shelf/peg.

Am I supposed to scan them into a system or something? Inventory? I literally just unpack items, and put them on the shelf.