Use "fewer" for countable nouns (e.g., fewer apples, fewer people) and "less" for uncountable nouns (e.g., less sugar, less time).
Yes, there are a few exceptions. For example, you would say "less than 10 minutes" or "less than $5", even though minutes and dollars are countable. These are idiomatic expressions that have become accepted as exceptions to the general rule.
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.
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