Are there any hidden rules in the hotel bar? What exactly is the job? Is it unsafe for girls to do this? 19 years old.

Generally speaking, there is no problem. If bar owners checks out, there may be some other reception work. Hotel-style checkout is more, and catering hotels may have other activities, mainly depending on where they are. The hotel is full of prominent people. If you want to hide the hidden rules, there is no need for daytime, hehe. Smaller hotels may have more hooligans, but they will not go crazy casually, and security guards will not agree. In short, don't worry too much. Doing a bar can earn a little money and try to do a good job. It really can't be changed.