Formal vs colloquial words and expressions

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I thought about creating this post about formal vs colloquial expressions and words because of an interaction with the user @IreneVincent. What I would like to say is that the word "salut" is more like a manly thing that men colloquially greet each other with when they shake hands or they simply meet. When a a male is greeting a female or just starting a colloquial conversation with her he says "buna". When a female is greeting someone whether male or female, she also says "buna" which means "hi". "Salut" also means "hi" but it is specifically used by men when they meet and greet other men. Notice that these two words ("buna" and "salut") are only for colloquial use not for formal use. For formal use, there are a few general forms of greeting someone (regardless of their gender) like "buna ziua" (which means good day) or "buna seara" (which means good evening) or "buna dimineata" (which means good morning). Another thing I would like to mention is that in my language: 1. "TU"=YOU in a colloquial way for addressing just one person 2. "VOI"=YOU in a colloquial way but for addressing more than one person like a group of two or more people "DUMNEAVOASTRA"=YOU in a formal way which can be used for both cases of addressing just one person or addressing a group of people.