Make a menu that responds to the page width. https://codepen.io/mortona42/pen/JjgdeoR
Make a menu that responds to the page width. https://codepen.io/mortona42/pen/JjgdeoR
Web.dev responsive web design course.
Stats for screen sizes used to browse the web.
Guide for checking correct responsive image syntax.
Using object-fit to place images in CSS.
srcset sizes.
Twitter responsive images.