Quantifiers are used to express quantity i.e. the amount of something; how many/much.
With countable nouns like apples, for example, we can ask and answer:
How many apples do you want?
I want four apples.
Notice we use many with countable nouns.
Now let's take a look at a non-countable noun: wine.
I have £10 and I want to buy this car:
Unfortunately this car costs £100,000
I don’t have enough money. The car is very expensive and I will never be rich enough to buy it.