JavaScript: summary of the 8 AI lessons

Each lesson is one step. The order is this.

1. API: send a question to Gemini with fetch and POST.
2. async/await: wait for the answer and hold the error with try and catch.
3. .env: do not keep the key in the code, .gitignore and a Vercel variable.
4. systemInstruction: a hidden role, a length and a refusal.
5. Memory: the user and model turns, the array goes on every request.
6. JSON: quiz questions with responseMimeType and JSON.parse.
7. RAG: find the matching paragraph and write only from it.
8. Agent: tools, functionCall and functionResponse.

These are not ready tools on the site. They are the next things you build from the parts you learned.

1. A chat page: systemInstruction changes, the history stays in an array.
2. A quiz page: the JSON questions become buttons and the right answers are counted.
3. A word list: a word is kept and the AI builds one sentence from it.

1. Turn the web page into an Android app with Capacitor or Expo.
2. Closed testing in Play Console: the app is given first to a small tester group.
3. Store PDF pieces in Supabase pgvector and search them with RAG.
4. Sign-in: each user should have their own chat history.