How many laws of thermodynamics are there?

Basically four: the zeroeth law, the first law, the second law and the third law.

There are four laws of thermodynamics; Zeroth Law of Thermodynamics. First Law of Thermodynamics. Second Law of Thermodynamics. Third Law of Thermodynamics.

The zeroth law of thermodynamics recognizes that if two systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other, thus supporting the notions of...

There are lots of them, in almost all the five books. There are 613 laws.

All of them. They are not laws until the ruling body accepts them as such, by whatever means is used by the country concerned.