Six essential CSS resources to boost your skills

So, you're feeling thoroughly chastened after reading about the 10 CSS mistakes that every web designer must avoid, and you're keen sort out your CSS skills? You're in luck; here's a collection of six absolutely top-notch CSS resources that'll help you ensure that you're writing the best, cleanest code imaginable.

HTML5 Rocks: Tutorials

Besides having great primers on how browsers work, HTML5 Rocks releases tutorials at least once a month about how to do things better in browsers.

Sass's @extend functionality

Sass, and particularly its @extend function, can help you move more towards component-based CSS and away from many of the bad habits mentioned in this article. Check out the documentation to find out how it works and see for yourself how powerful it can be.

Optimise browser rendering from Google

A classic reference on rendering best practices, loaded with information on how browsers render, helping you better know the browser and write better CSS.

Writing efficient CSS from Mozilla

Mozilla's reference on efficient CSS is short and sweet, making it a great training resource for new or onboarding developers.

Optimising browser rendering from Adobe MAX 2013

Michael Labriola discusses browser rendering as it relates to performance. This hour-long session and other videos from this year's Adobe MAX are available online, and worth a watch.