When do you use "Comment allez-vous ?" vs "Comment ça va ?"
You have to be formal, polite, respectful with the person you are talking with : Comment allez vous ?
You are talking to several people : Comment allez-vous ?
You know very well the person you are talking with : Comment ça va ? -> Ca va ? Comment vas-tu ?
The video in spanish : https://pollylingu.al/fr/es/videos/4591