Css Preprocessors

Question

Which css Preprocessor is Best?
Why we use css preprocessors?
What's the difference between Sass/Less/Scss?
And which is easy to learn?

Note: I have searched in discussion feed those answers are too old!....

Answer 1

1. They all function roughly the same so there is no definitive best
2. They allow you to write large complicated .css files in a more streamlined format and other features such as the use of variables
3. scss is a newer different format of writing sass. Between sass and less a lot of small things, not many significant things
4. I find less' documentation to be better but neither are that hard to learn if you know css well. Sass syntax is more like ruby so that can be jarring but scss is more similar to pain css

If you are learning with hopes of becoming a professional id recommend scss/sass first as they are more widely used. If you want to learn one either of Less/stylus/scss&sass are all fine and do the job they need to