πWe use a lot of and lots of in informal styles.
πLots of is more informal than a lot of.
πA lot of and lots of can both be used with plural countable nouns and with singular uncountable nouns for affirmatives, negatives, and questions:
β Weβve got lots of things to do.
β Thatβs a lot of money.
β There werenβt a lot of choices.
β Can you hurry up? I donβt have a lot of time.
β Are there a lot of good players at your tennis club?
β Have you eaten lots of chocolate?