[threatofrain]

This content is associated with a $75 web course. The pricing page was a little hard to find for some reason.

https://learnjavascript.online/pay.html

For a brief overview of modern JS I would suggest Dr. Axel Rauschmayer's JavaScript for impatient programmers (ES2022):

https://exploringjs.com/impatient-js/toc.html

Just about all chapters are free.