Here's how it works:
* Little is used for non-countable nouns (e.g., time, money, happiness).
* Less is used for both countable and uncountable nouns.
For example:
* "I have less time today than yesterday." (Uncountable noun)
* "There are fewer apples in the basket today." (Countable noun)
Note: "Fewer" is the comparative form of "few" which is used for countable nouns.