jQuery allows for too much productivity for web developers to stop using it completely. But they should understand when to use it, and why.
TypeScript recreates the Duck Simulator/Strategy pattern described in the “Head First Design Patterns” book. With lots of resource links.
How I set up Babel, Browserify, Babelify & Babel ES2015 presets for web development. Great for Babel beginners. Contains lots of resource links.
A demo of how to optimize CSS with Gulp, Grunt and tasks like uncss and critical path css. Has a link to fully-commented code on GitHub.
kaidez used Node to create a tool for scaffolding out web development projects. Includes a link to thoroughly commented code on GitHub.
A Web Components demo using just templates and Shadow DOM, mostly templates. Post includes many links to Web Component learning resources.
CSS3 media queries can help sites perform better in Google search results and the W3C officially recommends them as a web standard.