Documentation on the Basics of LangGraph with a simple Chatbot as an example.
Seting a .env file is reccommended for security. Simply changed the file name from .env.example to .env and fill in your_key.
However, if you're only running and testing out the note, you could also add your API keys like this:
os.environ["OPENAI_API_KEY"] = "your_key"
os.environ["TAVILY_API_KEY"] = "your_key"
os.environ["ANTHROPIC_API_KEY"] = "your_key"