There are many different ways to greet someone in Engpsh. Here are a few common examples:

Hi! / Hello!
Good morning! / Good afternoon! / Good evening!
How are you?
How's it going?
What's up?

In general, you can use these phrases to greet someone in a casual or informal setting. In more formal settings, you might use a more formal greeting pke "Good day" or "Nice to meet you." It's also common to shake hands or give a nod when greeting someone in a formal setting.