Quantum theory

I’m reading the book The Science of Freedom and I didn’t understand how a wave is different from an electron.
Why is it only with regard to the electron that it is impossible to check where it will be, while with regard to another wave it is possible?
Is it because the electron can also behave as a particle? After all, if it is not examined by a detector, it behaves as a wave, so in a way that it is not examined by a detector, can its position be known like another wave?
I would be happy to explain.