I learned from w3schools.com but there are better resources now. MDN is generally a better resource https://developer.mozilla.org/en-US/docs/Learn/JavaScript
I also know that Harvard offers some CS courses for free online - https://pll.harvard.edu/course/cs50s-web-programming-python-...
- It is already possible to run LLMs and langchain.js directly in the browser. The web is the dev environment if you code JS.
I think it has fundamental DX benefits over python for complex prompt chaining (or I wouldn't be building it!) Even still -- if their focus is purely on AI, python is still the better choice starting from scratch. The python AI ecosystem has many more libraries, stack overflow answers, tutorials, etc available.