what is the difference between dont have ans doesn't have

Don't have :- It is used when the subject is plural number. It is also used with "I" and "You". Ex :- They don't have any car. I don't have a cycle. Doesn't have :- It is used when the subject is 3rd person singular number. Ex :- She doesn't have a doll. Kusum doesn't have cycle.

in Simple Words. Use "Don't have" with I, we, you, they. and "doesn't have" with he, she, it.