1. study group
1.1. interest
1.2. logistics
2. organization strategies
2.1. bem
2.2. oocss
2.3. smacss
2.4. suit
2.5. solid
2.6. csstyle
2.7. rscss
2.8. mvcss
2.9. amcss
2.10. amcss
2.11. functional css (https://marcelosomers.com/writing/rationalizing-functional-css/)
3. browser compatibility
3.1. caniuse
4. inspiration and thought exercises
4.1. http://www.csszengarden.com/
4.2. http://codepen.io/ryandunn/pen/eZgmMY
4.3. http://tympanus.net/codrops/
5. thought leaders
5.1. eric meyer (meyerweb.com)
5.2. chris coyier (css-tricks.com)
5.3. rachel andrew (css grids, rachelandrew.co.uk)
5.4. lea verou (lea.verou.me)
5.5. rachel nabors (animation, rachelnabors.com)
5.6. sara soueidan (vectors, sarasoueidan.com)
5.7. jeffrey zeldman (zeldman.com)
5.8. ethan marcotte (responsive, ethanmarcotte.com)
5.9. philip walton (philipwalton.com)
5.10. ire aderinokun (bitsofco.de)
6. research/education/reference
6.1. newsletters
6.1.1. http://css-weekly.com/
6.1.2. http://heydesigner.com/
6.2. websites
6.2.1. http://tympanus.net/codrops/css_reference
6.2.2. https://developer.mozilla.org/en-US/docs/Web/CSS/Reference
6.3. conferences
7. scope
8. generating
8.1. post css
8.2. precompilers
8.2.1. scss (sassy css)
8.2.1.1. mixins
8.2.1.2. @extend
9. applying
9.1. link
9.2. inline
9.2.1. critical/above-the-fold
9.3. shadow dom
10. language/syntax
10.1. spec
10.1.1. css vs css2 vs css3 (2.1+) vs modules (there is no css4)
10.1.2. http://julian.io/tomorrows-css-syntax-with-cssnext/
10.2. scope
10.3. !important
10.3.1. or !please via https://github.com/idiot/Spiffing
10.4. inherit
10.5. currentColor
10.6. units
10.6.1. rem vs em
10.7. rules, properties, selectors
10.8. state selectors
10.8.1. e.g., :hover
10.9. pseudo elements
10.10. pseudo selectors
10.10.1. :nth-*, :not
10.11. descendant, sibling
10.11.1. >, +, ~
10.12. attribute selectors
10.12.1. e.g., [name*="foo"]
10.13. color
10.13.1. hex
10.13.2. abbreviated hex
10.13.3. named
10.13.4. rgba
10.13.5. hsl, hsla
10.14. gradients
11. design
11.1. interactive
11.1.1. radio or checkbox as state
11.1.1.1. http://lea.verou.me/2011/06/pure-css-tic-tac-toe/
11.1.1.2. http://codepen.io/elad2412/pen/hBaqo
11.1.2. http://victordarras.fr/cssgame/
11.2. visual
11.2.1. transitions and animations
11.2.1.1. transitions
11.2.1.2. animations (keyframes)
11.2.2. typography
11.2.2.1. vertical rhythm
11.2.2.2. kerning
11.2.2.3. ligatures
11.2.2.4. swashes
11.2.2.5. small caps
11.2.3. color
11.2.3.1. meaning, symbolism
11.2.3.2. contrast, color-blindness
11.2.4. positioning
11.2.4.1. layout/grid
11.2.4.1.1. grid systems
11.2.4.1.2. tabular
11.2.4.1.3. holy grail
11.2.4.1.4. flexbox
11.2.4.1.5. css grid spec
11.2.4.1.6. responsive
11.2.4.2. snap points
11.2.4.3. sticky position
12. specificity rules
13. tricky concepts
13.1. document flow
13.2. box-sizing
13.3. position
14. frameworks and resets
14.1. frameworks
14.1.1. bootstrap
14.1.2. pure
14.1.3. zurb/foundation
14.1.4. semantic-ui
14.1.5. materializecss
14.1.6. scooter
14.2. resets
14.2.1. https://necolas.github.io/normalize.css/
14.2.2. http://html5doctor.com/html-5-reset-stylesheet/
14.2.3. http://meyerweb.com/eric/tools/css/reset/