1. Difference in roasting degree of coffee beans: Deep roasting will have a heavier, more bitter and richer taste, which is suitable for making espresso, and then making espresso (latte, cappuccino, caramel macchiato, mocha). Moderately roasted coffee beans will have higher acidity and lighter taste, which is suitable for brewing coffee.

2. Raw coffee beans themselves have no coffee flavor, and they can only smell rich coffee flavor after being cooked. Therefore, the roasting of coffee beans is the transformation process of the internal components of coffee beans. Only after roasting can you smell the aroma of coffee.

3. Coffee is a kind of beverage made of roasted and ground coffee beans. As one of the three major drinks in the world, it has become the main drink popular in the world together with cocoa and tea.

4. Coffee tree is a perennial evergreen shrub or small tree of Rubiaceae. Coffee for daily drinking is made from coffee beans and various cookers. Coffee beans refer to nuts in the fruit of coffee trees, which are baked in an appropriate way. A cup of standard coffee should not be bitter. A qualified barista will strictly carry out every step when making coffee, and finally the coffee presented to the guests will show different degrees of sweetness and acidity in taste.