1. organization strategies
1.1. bem
1.2. oocss
1.3. smacss
1.4. suit
1.5. solid
1.6. csstyle
1.7. rscss
1.8. mvcss
1.9. amcss
1.10. amcss
1.11. functional css (https://marcelosomers.com/writing/rationalizing-functional-css/)
2. browser compatibility
2.1. caniuse
3. scope
4. generating
4.1. post css
4.2. precompilers
4.2.1. scss (sassy css)
4.2.1.1. mixins
4.2.1.2. @extend
5. applying
5.1. link
5.2. inline
5.2.1. critical/above-the-fold
5.3. shadow dom
6. language/syntax
6.1. spec
6.1.1. css vs css2 vs css3 (2.1+) vs modules (there is no css4)
6.1.2. http://julian.io/tomorrows-css-syntax-with-cssnext/
6.2. scope
6.3. !important
6.3.1. or !please via https://github.com/idiot/Spiffing
6.4. inherit
6.5. currentColor
6.6. units
6.6.1. rem vs em
6.7. rules, properties, selectors
6.8. state selectors
6.8.1. e.g., :hover
6.9. pseudo elements
6.10. pseudo selectors
6.10.1. :nth-*, :not
6.11. descendant, sibling
6.11.1. >, +, ~
6.12. attribute selectors
6.12.1. e.g., [name*="foo"]
6.13. color
6.13.1. hex
6.13.2. abbreviated hex
6.13.3. named
6.13.4. rgba
6.13.5. hsl, hsla
6.14. gradients
7. specificity rules
8. tricky concepts
8.1. document flow
8.2. box-sizing
8.3. position
9. frameworks and resets
9.1. frameworks
9.1.1. bootstrap
9.1.2. pure
9.1.3. zurb/foundation
9.1.4. semantic-ui
9.1.5. materializecss
9.1.6. scooter
9.2. resets
9.2.1. https://necolas.github.io/normalize.css/
9.2.2. http://html5doctor.com/html-5-reset-stylesheet/
9.2.3. http://meyerweb.com/eric/tools/css/reset/
10. global/local CSS
10.1. https://medium.com/seek-ui-engineering/the-end-of-global-css-90d2a4a06284
11. specifying
11.1. houdini (task force)
12. lint and code styles
12.1. CSScomb
12.2. CSS Lint
12.3. stylelint
13. study group
13.1. interest
13.2. logistics
14. inspiration and thought exercises
14.1. http://www.csszengarden.com/
14.2. http://codepen.io/ryandunn/pen/eZgmMY
14.3. http://tympanus.net/codrops/
15. thought leaders
15.1. eric meyer (meyerweb.com)
15.2. chris coyier (css-tricks.com)
15.3. rachel andrew (css grids, rachelandrew.co.uk)
15.4. lea verou (lea.verou.me)
15.5. rachel nabors (animation, rachelnabors.com)
15.6. sara soueidan (vectors, sarasoueidan.com)
15.7. jeffrey zeldman (zeldman.com)
15.8. ethan marcotte (responsive, ethanmarcotte.com)
15.9. philip walton (philipwalton.com)
15.10. ire aderinokun (bitsofco.de)
16. research/education/reference
16.1. newsletters
16.1.1. http://css-weekly.com/
16.1.2. http://heydesigner.com/
16.2. websites
16.2.1. http://tympanus.net/codrops/css_reference
16.2.2. https://developer.mozilla.org/en-US/docs/Web/CSS/Reference
16.3. conferences
17. design
17.1. interactive
17.1.1. radio or checkbox as state
17.1.1.1. http://lea.verou.me/2011/06/pure-css-tic-tac-toe/
17.1.1.2. http://codepen.io/elad2412/pen/hBaqo
17.1.2. http://victordarras.fr/cssgame/
17.2. visual
17.2.1. transitions and animations
17.2.1.1. transitions
17.2.1.2. animations (keyframes)
17.2.2. typography
17.2.2.1. vertical rhythm
17.2.2.2. kerning
17.2.2.3. ligatures
17.2.2.4. swashes
17.2.2.5. small caps
17.2.3. color
17.2.3.1. meaning, symbolism
17.2.3.2. contrast, color-blindness
17.2.4. positioning
17.2.4.1. layout/grid
17.2.4.1.1. grid systems
17.2.4.1.2. tabular
17.2.4.1.3. holy grail
17.2.4.1.4. flexbox
17.2.4.1.5. css grid spec
17.2.4.1.6. responsive
17.2.4.2. snap points
17.2.4.3. sticky position