A large number of something

बहुत सारा

English Usage: There are a lot of stars in the sky.

Hindi Usage: आसमान में बहुत सारे तारे हैं।

Very much; to a great extent

बहुत ज़्यादा

English Usage: She likes him a lot.

Hindi Usage: उसे वह बहुत पसंद है।

Large in quantity or number

बड़ी मात्रा में

English Usage: He has a lot of experience.

Hindi Usage: उसके पास बहुत अनुभव है।