Do I need to tip when spending money in Hong Kong, such as staying in a hotel or eating?

As long as the hotel doesn't help you with your luggage, you don't have to go to the restaurant, but most restaurants charge a few dollars in change, because when you eat 90 to 100, he won't give you 10 change, but he will give you 1-2-5 change, so that you can stay there for 2 hours, and that's all. Of course, it is ok not to give them. This is just us.