Most sites are focused on rebuilding rather than redesigning to improve speed, cross-browser compatibility, responsiveness across devices and screen sizes. Mobile users now outnumber iOS and Android app users, so responsive design is important. Responsive design means designing for different interfaces through techniques like responsive images to reduce file sizes for different devices. HTML5 provides new elements and features but only established ones should be used. Real-time analytics can help forecast the future by focusing on current user behavior rather than past data.