LangChain Course — Starter Project
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1. Install Python 3.14.5 from https://www.python.org/downloads/
   (Windows: tick "Add python.exe to PATH" during install)
2. Unzip this folder to a path like C:\projects\langchain-course
3. Copy .env.example to .env and add your OPENAI_API_KEY
4. Create venv:  python -m venv .venv
5. Activate:
     Windows:  .\.venv\Scripts\Activate.ps1
     macOS/Linux:  source .venv/bin/activate
6. Install:  pip install -r requirements.txt
7. Verify:  pip show langchain
8. OpenAI script:  python hello_langchain.py
9. Local Ollama script:  python hello_ollama.py  (Ollama running + llama3.2 pulled)
10. Model params demo:  python model_params_demo.py
11. Architecture demo:  python architecture_demo.py
12. Prompt templates demo:  python prompt_templates_demo.py
13. Prompt engineering demo:  python prompt_engineering_demo.py

Course: https://qlist.co.in/coding/langchain-course/