Specifically for JS? I didn't give him anything material actually. I gave him a serious of small challenges starting with: "write a function that displays hello world on the screen" ... he already know HTML/CSS and he talked to Gemini to figure out the best way to use a function in HTML and it guided him towards JS. He give me a solution in a JS console, with a function that he executed.

Then I built on that with more challenges. He continued to work with Gemini. He talks about how he uses Gemini in his blog post, it's an interesting learning technique he found.

So mostly he's learning by doing. He's figuring out "how to do X" either using a hint from me or just by asking Gemini which gives him some guidance. Then he has to figure out how to apply the hint/samples to his actual game. His IDE has no LLM built-in, he uses the LLM from the browser.