What’s the difference between “don’t have” and “haven’t”?

Well, "haven't" is useful for Britanic english, some examples:

• I don't have a car
• I haven't a car
• She doesn't a hat
• She hasn't a car All the examples are correct, but (hasn't, haven't) are usest in britanic english.

Thank you, this was a very good question!

If you want to know if someone has something. basically, you only use the have verb for talking about the present: Do you have money? Yes, I have No, I don't / No, I don't have.

If you use Haven't you are speaking in perfect time: Have you spoken to Maria? Yes, I have No, I haven't I hope to answer your question.

Hi!

• Don't have is present simple and we use it como "tener" en español.

Subject + don't + have + complement

For example, I don't have a car. (Yo no tengo un carro)

• Haven't is present perfect and we use it como "haber" en español.

Subject + have not (haven't) + past participle + complement

For example, I haven't eaten that. (Yo no me he comido eso)