JavaScript var is dead? We should use ES2015 let and const now?
CSS is getting variables, nesting, scoping and custom selectors. Preprocessors like Sass and Stylus are dead, long live PostCSS.
Just learned Grunt? Oh you should use Gulp – wait no, Webpack.
Still laying out your sites using floats like a sucker? Flexbox is here!
Just built a project using protocol relative // – that’s an anti-pattern now. Oh and jQuery .hide() is bad for performance, so cut that out.
The tips given at the end of the post are exactly how I (try to) keep up with everything. I would add “Attend a good conference” – such as Fronteers – to that list.