This playlist with 9 videos https://www.youtube.com/watch?v=TAMIveu0Aag&list=PLgTh9sDnKCUM9cgjfwIkJCSMkUGYmjB6- covers instruments and technics to debug and profile apps.
https://www.youtube.com/watch?v=TAMIveu0Aag&list=PLgTh9sDnKCUM9cgjfwIkJCSMkUGYmjB6-