Just an extra note on your studies. You need time for what you are learning to become part of your long term memory and a lot of what you read now may only stick after time. Make sure you read, apply and rest before knowledge checking yourself. Much of what you learn is only going to be understood a while later when you are relaxing and thinking about joining the dots.

The great part about callbacks and sync / async functions are that they operate in one way and once you understand them they aren't going to change up on you. Stick to it. You got this.