https://hellowebsites.ca/help/getting-started/responsive-and-mobile-design/
Responsive And Mobile Design | Hello Websites
Say Goodbye to Bad Websites
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https://swiffyslider.com/
Swiffy Slider - Responsive and Mobile Touch Carousel
CSS and javascript responsive slider and carousel - lightweight and fast
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https://getbootstrap.com/docs/3.4/
Bootstrap · The world’s most popular mobile-first and responsive front-end framework.
Bootstrap, a sleek, intuitive, and powerful mobile first front-end framework for faster and easier web development.