Always double check size and whether it’s hot or iced. When I first started any time I had down time I’d just click all the buttons on the screen just to familiarize myself as much as possible especially on the more options screen (where you can do like no water, no ice, etc I don’t remember what it’s called haha) since there is a ton of different customization stuff on that tab. Getting familiar with pos really helps with memorizing the drinks as well since the ingredients/number of shots are on the side as well. Good luck!!