Embark on a comprehensive 4.5-hour course to master HTML5 and CSS3 from the ground up. Set up your development environment with Atom and essential packages, then dive into structuring HTML5 documents and utilizing heading tags. Learn to incorporate images, link CSS files, and use comments effectively. Explore RGB color codes, classes, IDs, and font properties in CSS3. Create subpages, style links as buttons, and design an impressive navigation menu. Discover advanced techniques like parallax backgrounds, font awesome icons, and scroll indicators. Delve into CSS3 Grid, float layouts, and embedding videos. Craft engaging footers, implement WhatsApp "Click to Chat" functionality, and create eye-catching portfolio designs with hover effects. Master image manipulation techniques like zoom, grayscale, and blur effects. Conclude by designing a beautiful contact form to round out your web development skills.