Puppy biting

Olivia🧚🏼‍♀️ • NYC living 🤍 🗽 22🥂🫶🏽

I have a 13 week old puppy. He’s always biting us and it does leave marks. How do I train him to stop? Google said to “high pitch scream, make your hands into a fist & put them across your chest, and then say “no”… well that shit is NOT working! What else can I try?