Use a responsive layout
Set the viewport meta tag
Use flexible grids and relative units
Make images and media scale properly
Use mobile-friendly font sizes
Keep buttons and links large enough to tap
Simplify navigation for small screens
Avoid horizontal scrolling
Optimize page speed
Test on multiple devices and screen sizes
Use CSS media queries
Prioritize important content for mobile
Avoid pop-ups that block the screen
Ensure forms are easy to use on mobile
Use touch-friendly spacing between elements