CSS with superpowers

If you miss the opportunity to get your CSS code more object oriented, SASS is very brilliant, I've used LESS for many years before I discover SASS, if you compare SASS and LESS with each other, LESS is much easier to learn, but when / If you can LESS, you can also learn SASS as they basically work the same way, but the syntax is slightly different and you have more options using SASS instead of LESS.

More and more open soruces projects have already rewritten their LESS code to SASS, and those who have not yet done so are about to convert their LESS to SASS. Then you can not SASS there is every reason to consider learning it.