How am I supposed to learn the property management system as a new employee?

I have worked for a little over a week now, and I've never ever felt so dumb in my life. I can check in and out really easily because I do it all the time every day, but the rarer things, like refunding, charging someone for theft or changing a room's temperature for example are really hard to learn and remember as I don't get a chance to repeat them, and then I end up bothering my colleagues with questions. I feel like such a burden because I can't even take phone calls lol. Does it get easier? Why is there zero interactive training simulation demo to learn this stuff?