I think you should learn to smile first, then learn to read words and observe colors, see the needs of guests, and then try to meet the requirements of guests. If some guests are not too particular, you can talk about it appropriately, needless to say, but it may be a little difficult for them to feel your sincerity, because they are not very expressive, but you can give them appropriate opinions and suggestions when eating. This can increase the guests' goodwill towards you. You can also learn to read, observe the guests' preferences, and then recommend some dishes to the guests at an appropriate time, so that the guests will feel that you are very attentive and will increase their goodwill towards you. In addition, you should learn to observe the needs of the guests, and then try to meet the requirements of the guests. If some guests are not very particular, you can talk about it appropriately, needless to say too much, but it may be a bit difficult for them to feel your sincerity. If you are a specific guest, it may be a little difficult, because they are not very good at expressing themselves, but you can give the guests appropriate opinions and suggestions during the meal, which can increase the guests' goodwill towards you.