[aercolino]

A nice thing about "hello world" applications is that you can always use them as the starting point for any other.

The first step forward would be to change it from "hello world" to "hello {{name}}" and have the user input their name and the application show a custom hello.

Having this minimal input / output, now you can invest some time to make your app secure. This will teach you a lot.

Then you should feel ready to allow users to register, log in, and log out. This will teach you DB stuff and a lot more about security.

Then you should feel ready to allow users to add a profile with an uploaded picture. This will teach you about sophisticated UI issues, and even more security.

Then, except for scalability, machine learning and a few other special but mainstream technologies, I think you should feel ready to learn anything else.