Bootstrap 4 introduces significant changes and new features, making it a preferred choice for front-end development. Utilizing Sass over Less enhances compilation speed and developer efficiency. The inclusion of Libsass streamlines compilation processes. Notable additions include the versatile card component, replacing older components like panels and thumbnails, and revamped button styles with flat designs and outline options. Typography adjustments, adopting 16px as the default font size, and utilizing rems for scalability, enhance readability and dynamic display. The introduction of display headings offers developers more options for standout typography. Additionally, Bootstrap 4 embraces Flexbox, simplifying layout customization and responsiveness.
