QRcode page using CSS flexbox, and Position: Fixed

Hey Everyone. I am absolutely new to the world of coding, but I have (hopefully) a strong interest in it. I just started learning wed development a month ago; worked on HTML and CSS, which are what I used in working on this project in VScode, then I uploaded it on Github pages. My next step is to move into Javascript. My Question is what next after that? A defined roadmap would be much appreciated PS: I'm self-learning with YouTube