Knowledge of using coasters

There are no formal or standard usage methods for coasters, and the key is safety and practicality. However, coasters are sometimes used as a foil, such as adding a coaster when drinking coffee, otherwise there will be no modern and elegant feeling. So what knowledge and precautions do you have when using coasters in daily life?
1. It is best to only make coasters. Coasters can be used for multiple occasions, as they may not have that kind of fun anymore;
2. The protection of coasters, regardless of the material of the coaster, should not be frequently bumped;
3. The cleaning of coasters can be done with water or by brushing, except for paper coasters.