When-someone-says-Hi-what-is-your-response?

 When someone says "Hi," a friendly response would be to match their tone with something like:

- "Hi! How's it going?"

- "Hello! Nice to see you!"

- "Hey! What's up?"

It depends on the context and your relationship with the person, but keeping it warm and engaging works well. How do you usually respond when someone greets you?