Learn to build a responsive Weather App using Vanilla JavaScript, HTML, and SCSS in this comprehensive tutorial. Explore key concepts including the Open Weather Map API, geolocation, persistent data storage, and Fetch API with Async/Await. Dive into mobile-first design principles, accessibility considerations, and serverless functions. Follow along as the project progresses from structuring semantic HTML and applying SCSS styles to implementing JavaScript functionality. Gain hands-on experience with debugging, accessibility testing using a screen reader, and deploying the finished application.