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Use have to when something is necessary. You must do it. With he, she and it, say has to.
subject + have to + verb (he / she / it + has to)
You have to show your ticket.
Passengers have to buy a ticket.
She has to show her ID.
Don't have to means it is not necessary. You can do it, but you do not need to. With he, she and it, say doesn't have to.
subject + don't have to + verb (he / she / it + doesn't have to)
You don't have to pay. It's free.
We don't have to bring food.
He doesn't have to wear a uniform.