ahh I'm surely not the most appropriate for that, as I said I'm still not very experienced in coding ^^'
I do know a few resources that explain the basics of HTML and coding (way better that I could) and it also helped me in understanding how things work!

Complete coding tutorial: https://toyhou.se/18536193.code-tutorials
Coding resources: https://toyhou.se/Elithian/characters/folder:881832
More resources: https://toyhou.se/2108365.-resources

there is also a live editor where you can view/edit your codes in real time, I think you can either use this site https://th.circlejourney.net/ or https://cheeriko.github.io/playhouse/editor/index.html
to edit my codes I like to explore around toyhouse or a specific coder, then select a few codes that I like and combine them
there isn't much to explain cuz it's basically just copy-pasting bits of codes and see what works and what doesn't, I really recommend to just start experimenting, remove/add bits of code and see what's changing. That's the best way to understand the concepts

hope that helps!