To talk about “not having” something, you negate the word 有 (yǒu) with 没 (méi). Remember this important point: if you negate 有, always use 没. The two words go together.

Examples:

我没有车。
Wǒ méiyǒu chē.
I don't have a car.
他们没有钱。
Tāmen méiyǒu qián.
They don't have money.
他没有学位。
Tā méiyǒu xuéwèi.
He doesn't have a degree.
That’s how you negate 有. But there’s a different word for everything else!