Learn how to securely store secret API or SDK keys in your JavaScript, HTML, and CSS projects in this 28-minute tutorial. Explore the process of implementing environment variables using Node.js, Webpack, and Dotenv Webpack. Follow along to enhance your project's security and organization by properly managing sensitive information. Gain practical insights with a real-world example, and access the final code on GitHub for reference. Perfect for developers looking to improve their project structure and safeguard critical data.