When you start programming your first web app you are doing something that you have never done before. It's a new challenge, a new opportunity, and in the case of software development, something so specific that it's probably never been done before.
Confusion, therefore, is a sign that you are heading in the right direction! It's a signal that you have engaged in the problem solving pursuit that is math and technology and that it's time for you to dig deeper and keep going because clarity awaits. Confusion means that you are thinking! The more you are exposed to the same things, the faster you can pick it up. Have faith that you will learn what you need to in order to succedd!
When you are learning a new technology, whether you are learning to write your first programming language, or just the latest framework, you go through this uncomfortable phase where you know that the code you are looking at is doing this THING but you don't understand HOW exactly it's happening.
This is a normal part of the process of learning a new technology, and it's a critical part of the process.
You see when you encounter a new programming language part of your learning process includes learning to train your eye. The way to train your eye is to read a good deal of code even when you don't totally understand what it's doing. You will learn.
You must believe in yourself. If others can do it? Why can't you? Nobody is smarter than you. Nobody is better than you. Everyone started from zero. Learning takes time and hard work. If you are willing to put in the work, you will succeed!