What should I bring to stay in a hotel in Hong Kong? What are the precautions?

You can use a very small amount of shampoo, which should be within 50ml. The socket is different from that in Chinese mainland, so it is recommended to provide an adapter when booking a hotel. The room rate must be paid, and nothing else is required. Tips are actually included in your room rate. It depends on your personal situation. If you want to keep it, 10 yuan will do.