Casual greetings?
I know there's おはよ vs おはよございます、but I'm wondering if there's a more casual or just shorter version of こんにちは. こんにちは seems more like a "Hello" which to me, is a bit too formal for friends. Any help is appreciated.

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u could say "おっす"(this is totally informal, manly way of saying 'hi' and is used only between friends)
or "やあ" (which is also informal and translated to 'hi' )

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おはよ →おはよう、 おはよございます→おはようございます