used to greet someone or to capture their attention in a friendly manner

やあ、そこに!, こんにちは、こちらに!
used to greet someone in a casual and welcoming manner

やあ, こんにちは
used as a greeting or a call to draw attention

あいさつ(あいさつ、または注意を引くための呼びかけ), やあ(やあの呼びかけ)
used as a greeting or conversation starter in casual settings

やあ、どうしたの?, 元気?
used as a friendly greeting or inquiry about what someone is doing or planning

なにをしているの?, どうしてるの?
used to inquire about current events, situations, or activities

どうしたの?, 何が起こっているの?
used to ask what is happening or what is going on

なにが起こってる?, 最近どうしてる?
used as a casual greeting to wish someone a good morning or to acknowledge the start of the day

おはよう (Ohayou), おはようございます (Ohayou gozaimasu)
used as a greeting or a way to acknowledge the time of day

こんにちは, 午後
used when greeting someone after a long time has passed since one's last encounter with them

ご無沙汰しています!, お久しぶりです!
a word that we use to greet someone when they arrive

ようこそ!, いらっしゃいませ!
used to express salutations or well-wishes to others

こんにちは!, おはようございます!
used to acknowledge someone upon meeting them

はじめまして, よろしくお願いします
what we say to greet someone in the morning
what we say to greet or say goodbye in the afternoon
what we say to greet or say goodbye in the evening
