What are the different ways to say 'Hello" in Irish?

I am currently learning the Irish language now, and keep looking at videos on youtube and they all have different ways of saying hello and it's kind of hard for me to tell what they are saying. On my program, it is telling my "hello" is "dia duit" where you say the "D" in "duit" silent but its a little bit accented so it sounds like "dia hwit". please give any, if not all, the ways to say hello in irish. THANK YOU!!!=)