I want to cancel the yearly subscription because last year it cut 124$ from my account. So my question is, if I cancel my subscription from the website, would it completely cancel my subscription?
Check this; it might be helpful. I think you can ask for a refund through Teachable because ‘Code with Mosh’ is considered a school there. Or, as they say, if you feel you are eligible for a refund but the school refuses to give your money back, you can contact the Teachable support team through this email.
I hope it helps. Let me know what happens with you. I would appreciate the knowledge. 
Good luck
Hey,
Yes cancelling from the website will stop your subscription and future payments.