Explore a step-by-step introduction to implementing Langchain in JavaScript through this comprehensive 13-minute video tutorial. Learn how to make calls to GPT-3.5-turbo or GPT-4, work with prompt templates, utilize memory, implement Langchain Agents, and handle streaming completions. Follow along as the tutorial guides you through creating six files, demonstrating how to combine various components for effective AI integration. Gain practical insights into building AI-powered applications using Langchain and JavaScript, with additional resources provided for further learning and community engagement.