Learn to build a cross-platform desktop application for resizing image dimensions using JavaScript and Electron in this comprehensive video tutorial. Explore the process of setting up the development environment, creating the main window, implementing common boilerplate code, and customizing the application menu. Discover how to add a user interface theme, handle content security policies, and create an about window. Dive into the core functionality by implementing image loading, dimension retrieval, and resizing capabilities. Master inter-process communication (IPC) between the renderer and main processes, integrate Toastify alerts for user feedback, and learn how to make the main window global. Conclude by testing the application in production mode and exploring options for packaging the app for different platforms.