Fewer refers to things that are countable.

Example: We had fewer people at the fundraiser than we had hoped.
Example: Fewer tornadoes occurred this year than last year.
Generally, less refers to things that are not countable.

Example: We had less rain this year than last.
Example: Less talking would help my concentration.
However, the expression less than is used in [...]

If you feel confident about forming plurals in English by adding an “s” or “es” at the end of the word, I’m about to make you feel a little wobbly. Although most noun plurals are formed this way, verb plurals are formed by removing the “s.”
For example, which verb is plural, talk or talks? Because [...]

English has many rules for writing numbers and just as many authorities disagreeing with each other about them. Here are some general rules that you may wish to keep handy.
Rule: Spell out single-digit whole numbers.
Example: I would like five copies.
Rule: Use numerals for numbers greater than nine.
Example: I would like 10 copies.
Rule: Be consistent within [...]

Good is an adjective while well is an adverb answering the question how.
Examples:
You did a good job.
Good describes job, which is a noun, so good is an adjective.
You did the job well.
Well answers how the job was performed.

Rule: With the four senses—look, smell, taste, feel—discern if these words are being used actively to decide whether [...]

A common error in using adjectives and adverbs arises from using the wrong form for comparison.
Incorrect Example: She is the poorest of the two women.
Correct Examples:
She is poor. (positive form)
She is the poorer of the two women. (comparative form)
She is the poorest of them all. (superlative form)

Some words have irregular comparative and superlative forms.
Examples:
bad/worse/worst
good/better/best
Incorrect Example: [...]