You can access seven videos and make exercises on every topic. It’s completely free, all you need to do is registration.
I assembled one full video for your convenience (you don’t have to do the exercises to unlock the next one).
watch video in dropbox
download video
download Slides (PDF)
Topics:
1: FOUNDATION (0:00 – 10:15 min)
2: VARIABLE (10:15 – 15:28 min)
3: MIXIN (15:28 – 24:25 min)
4: EXTEND (24:25 – 28:12 min)
5: DIRECTIVE (28:12 – 37:54 min)
6: MATH + COLOR (37:54 – 44:18 min)
7: RESPONSIVE (44:18 – 50:25 min)