LangChain v1 Tutorial #1 - Complete Guide from Basics to Advanced

About this lesson

🚀 Welcome to the BRAND NEW LangChain v1 Complete Tutorial Series! LangChain has released a production-ready v1.0 with major improvements - faster, more secure, and completely redesigned. In this first episode, we'll understand WHY we need LangChain and set up our first LLM integration! 📌 What You'll Learn: ✅ Why LangChain is essential for LLM applications ✅ How to switch between different LLMs (OpenAI, Groq, Claude, Gemini) with ONE interface ✅ Setting up your development environment ✅ Creating OpenAI and Groq API keys (with free tier!) ✅ Using .env files for secure API key management ✅ Your first LLM call with LangChain v1 🔧 Code Used in This Video: ```python from dotenv import load_dotenv load_dotenv() from langchain_openai import ChatOpenAI model = ChatOpenAI() model.invoke("Add 2 and 3") from langchain_groq import ChatGroq model = ChatGroq(model="openai/gpt-oss-20b") model.invoke("Add 2 and 3") ``` 📦 Requirements: - Python 3.10+ - langchain - langchain-openai - langchain-groq - python-dotenv 🔗 Useful Links: 📄 LangChain v1 Official Docs: https://docs.langchain.com 🔑 OpenAI API Keys: https://platform.openai.com/api-keys 🔑 Groq API Keys: https://console.groq.com 💻 GitHub Repository: https://github.com/NajiAboo/langchain-v1/blob/main/00-introduction/00_introduction.ipynb 🎯 This Series is Perfect For: - Beginners starting with LangChain - Developers migrating from v0.1/v0.3 - Anyone building production LLM applications - AI/ML enthusiasts ⏱️ Timestamps: 00:00 - Introduction & Series Overview 01:30 - Why Do We Need LangChain? 03:45 - What is LangChain v1? 05:20 - Environment Setup 07:15 - Creating OpenAI API Key 09:30 - Creating Groq API Key (Free Tier) 11:45 - First LangChain Code 14:20 - Testing with Different LLMs 16:30 - Next Episode Preview 📚 Previous LangChain Playlists (Older Versions): - LangChain v0.1 Playlist: [Link] - LangChain v0.3 Playlist: [Link] 👨‍💻 About Me: Hi, I'm Mohamed Naji Aboo (Naji), and I create in-depth tutorials on AI

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