Salut, comment vas-tu? (informal, for someone you know well)
Here's a breakdown:
* Salut: Hi (informal greeting)
* Comment: How
* vas-tu? are you (informal, used for "you" singular)
You can also use a more formal version:
Bonjour, comment allez-vous? (formal)
This is used when talking to someone you don't know well or someone older than you.
Important Note: French has a formal and informal way of speaking. It's important to choose the right form based on your relationship with the person you are talking to.