What to learn next after HTML5?

Question

So...I am studying HTML4 and 5 (HTML4 because I have a book on it, and it gives a good background for me to jump off of). I am not that great yet, but I have written up some
webpages in notepad and plan to do more later. When I am done going through this though, what other languages should I learn and what order should I learn them in? What are some good reliable sources for doing this? I have found a couple websites that I can use and Code.org, but there might be other places. Thank you so much!

Answer 1

According to https://www.sololearn.com/faq/

HTML->CSS->JS->JQuery->PHP->SQL

Answer 2

Thank you.