Are there any services for learning Haml, Slim, Less, Sass?

Question

css

Are there any services for learning these technologies?
And is it worth learning haml/slim at all?

Answer 1

What is there to study? Dock on SASS is read in an hour

Answer 2

Why is the magnificent Stylus not mentioned? :)

Answer 3

LESS will be more pleasant.

Answer 4

I use LESS. Enough documentation on the site + half an hour of your time

Answer 5

so purely for show thesassway.com
but as they say, it's better to try once than read several times, especially since you can even start by reading the introduction of sass-lang.com/guide
with other things similarly

Answer 6

sass-scss.ru - sass documentation in Russian