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Responsive Web Design
freeCodeCamp
Learn responsive web design principles and build modern, accessible websites with this free course from freeCodeCamp!
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UI/UX design pattern library from real apps
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Practical UI design patterns and checklists
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uxdesign.cc
UXdesign.cc is an online publication offering articles, tutorials, and case studies on user experience and product design. It covers UX research, interaction design, usability, and practical UI design patterns.
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smashingmagazine.com
Smashing Magazine is a web design publication offering practical UI/UX tutorials, in-depth articles, and front-end development resources, including guides, case studies, and downloadable books.