1) "Hey there" : This is casual, friendly, and familiar. It could be used when talking to good friends.
2) "What's going on?" : This is casual and could be used between friends or acquaintances in an informal situation, like a party.
3) "Hey! What's up?" : This is casual and could be used between friends, siblings, etc.
4) "Good morning" or "good afternoon" : These greetings are generally more formal and are often used in restaurants, hotels, shops or at work between colleagues.
5) "How are you doing today?": This is formal and might be used between a professional and a client or customer or between colleagues or a boss and his or her workers.
6) "How's everything?" : This is simply another way of saying "how are you. " It is usually used casually.
7) Long time! How are you?: This is used when meeting someone after a long gap.
8) "How are things?" : This is very similar to "how is everything?" and is perhaps more casual than "how is everything?"
9) "Good to see you, " "great to see you, " "nice to see you" : These could all be used informally or casually between business colleagues, friends, or family members. These phrases are often used when you haven't seen the person in a while.
10) "What's happening": This is mostly used by young people (college age or younger). They might use the phrase to greet their friends when they arrive at a party or when they see each other in class.
11) "How's it going?" : This is casual, especially when you shorten it as in "How's it goin'?"
12) "Good evening": This is formal and is often used in upscale (expensive) hotels or restaurants to greet guests, or in official settings.
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