A Place To Find Any Information On Responsive Layouts: This Is Responsive
When creating a responsive website, there are many challenges to cope with like defining the breakpoints, managing the block, handling images, video, navigation, etc.
This Is Responsive is an impressive and must-bookmark resource for anyone working on such layouts.
It features responsive patterns for the layout, tables, navigation, forms, images and more.
Also, it has a very well categorized list of links to responsive-related resources where you can find articles, tutorials and libraries/plugins.