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An awesome list limited to the best CSS learning resources

This list is mainly about CSS – the language and the modules. Not about naming conventions, architecture paradigms, frameworks, pre-processors, post-processors, CSS-in-JS or other aspects of todays CSS ecosystem.

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CSS References
CSS in a nutshell
Fundamental concepts
CSS units
Selectors
Custom properties (aka CSS variables)
Layout
Animation
Related

CSS References

codrops - An extensive CSS reference offering way more content than MDN.
Can I use - Interactive browser support tables for CSS (and HTML5).

CSS in a nutshell

Introduction to CSS - This screencast series will teach you the basics of CSS in about one hour.

Fundamental concepts

The cascade - This article explains what the cascade is and how this affects you.
Specificity and inheritance - Understanding specificity and inheritance is important to master CSS. This article will help.
CSS Box Model - An article explaining the foundation of layout on the web.
- Also have a look at the detailed information about the box-sizing property.
Responsive Design - Extensive information about all aspects of responsive design to make sites that look great and work well for everyone.

CSS units

The Lengths of CSS - Overview covering absolute and relative units.
Fun with Viewport Units - Imparts the basics and shows some nifty use-cases.

Selectors

Basic CSS Selectors - An introduction to the very basic CSS selectors you need to know.
Advanced CSS Selectors - Level up your knowledge. From attribute selectors to CSS3 pseudo classes.
CSS Diner - Learn how to use CSS selectors with this fun little game.

Custom properties (aka CSS variables)

CSS Variables: Why Should You Care? - A short introduction to CSS variables.
Locally Scoped CSS Variables: What, How, and Why - Describes the advantages of locally scoped CSS variables.
Using CSS variables correctly - Patterns and anti-patterns for using CSS variables.
Everything you need to know about CSS Variables - In depth article going beyond the basics of CSS Variables using real-world examples.
Getting Reactive with CSS - Mindblowing talk about the possibilities of the combination of CSS variables and functional reactive programming in JavaScript.

Layout

Learn CSS Layout - Learn about CSS layout techniques in 5 chapters.
Layout Land - Jen Simmons video series about the new CSS Layout possibilities.
Laying Out The Future With Grid And Flexbox - Introduction of a new layout system encompassing Flexbox, CSS Grid and the Box Alignment Module.

Classic layouting

Floats - In depth information about how to use (and clear) floats.
Positioning Types - A closer look at a few little-known things related to the CSS positioning layout method.
inline-block - Shows in which cases it makes sense to use the display property inline-block for layouting.

Flexbox

A Complete Guide to Flexbox - All you need to know about Flexbox on one page.

Flexbox playground - Play with Flexbox examples on CodePen.
Flexbox Defense - A tower defense game in the browser to learn about Flexbox with fun.
Flexbox Froggy - Learn all the basics of Flexbox with a fun game involving frogs and lily pads.
Flexbugs - Community-curated list of flexbox issues and cross-browser workarounds for them.
Flexbox Zombies - A training course driven by a storyline where you use Flexbox and a crossbow to hunt zombies.
What the Flexbox? - A simple, free 20 video course that will help you master CSS Flexbox!

Grid

A Complete Guide to Grid - All you need to know about CSS Grid Layout on one page.
Grid by Example - Besides examples of how to use Grid, this site also has additional useful learning resources.
Designing with Grid - Talk about the new layout possibilities CSS Grid is offering.
Grid Garden - Lovely game where you write CSS code to grow your carrot garden.
GridBugs - Community-curated list of Grid interop issues and workarounds for them.
Grid Critters - Learn CSS grid layout by mastering an adventure game.
CSS Grid - Learn CSS grid with Wes Bos - Free 4 hours video course, 25 Videos.

Animation

CSS Transitions and Transforms for Beginners - An introduction to CSS transitions and CSS (2D) transforms.
All you need to know about CSS Transitions - Also addressing advanced topics from chaining and events to hardware acceleration and animation functions.
CSS 3D transforms - Multi page tutorial with examples like card flip and carousel effects.
CSS Animation for Beginners - Imparts the concepts of CSS animations with keyframes.
animatable - Nice little page demonstrating which CSS properties are animatable.

Awesome JavaScript Learning - A tiny list limited to the best JavaScript learning resources.