To design a simple footer in HTML, consider the following best practices: 1. Avoid clutter and keep the design straightforward and aligned with the website's leading tone. 2. Include links to important information such as contact details, copyright notices, and privacy policies. 3. Organize the links logically to facilitate easy navigation for visitors. 4. Add a copyright notice to establish ownership of the website's content. 5. Utilize graphic elements like logos or social media icons to add visual appeal. 6. Ensure readability by using contrasting colors and appropriate font styles.