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 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 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 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!
used to acknowledge someone upon meeting them

はじめまして, よろしくお願いします
something we say when we want to greet or say hello to someone in the morning

おはようございます, おはよう
something we say when we want to say hello or goodbye to a person in the afternoon

こんにちは, 午後こんにちは
