This is probably one of the most intuitive signs you will learn. Everyone has their own flare of how they may greet, but you can (almost) never go wrong!

In ASL, the sign for "hello" is a common way to initiate a conversation and show friendliness.
Learning to sign is a great start. For the moments that have to be right (a medical appointment, a parent-teacher meeting, a legal conversation) Ava connects you with a credentialed ASL interpreter over video in the Ava app, on demand or scheduled ahead. Available 24/7, with live captions included.