What are healing crystals? What are the benefits and how to use them?

We learned that all objects in this world vibrate, all objects have different frequencies, and in fact everything in this seemingly material world is energy. Energy that resonates at different frequencies and is constantly affecting other objects. Energies that can revive or destroy a person. In the meantime, some people who are aware of this use it for their benefit and of course for others. And they do this with different stones, which is called crystal therapy.