How to save data between scenes in unity?

Question

Unity

Immediately I say I'm an amateur ...
I wrote these lines to save the data (health, damage, etc.) for the next scene. I attached this script (InfoData), for example, to the main camera (I tried it and not to it)

The button (which, if pressed, causes damage) refers to the main camera (because there is a script with the necessary data in it.)



BUT when the scene changes, this button will not access anything


And so in all buttons, animations, etc.

The data is saved, but I can’t access it, because the buttons do not see the main camera of the FIRST scene, and the SECOND main camera has completely disappeared (but it’s not needed, because it contains old data).

In what ways can I use the same data in different scenes?
If you save everything else (for example, throw the script into the canvas, where all the buttons and pictures are) too, then I already save everything, and all my scenes become the same.

Answer 1

And what's that?