In Spanish, there are several ways to say 'hello' or 'hi', depending on the time of day and the level of formality. The most common ways to greet someone in Spanish are: "hola" (OH-lah), which means "hello", "bonos" (BOH-nose), which is a more formal way of saying "hello" or "goodbye", and "chau" (CHOW), which is an informal way of saying "hi" or "see you later". If you want to say 'hi' in a more friendly way, you can use "hola amiga" (OH-lah ah-MEE-gah), which means "hello friend", or "hola mijo" (OH-lah mee-HO), which means "hello my son/daughter". The key to mastering the Spanish greeting is to practice and get a feel for how the language is used in different contexts.