How to save a variable when reloading a scene?

Question

C++ / C#

Hello.
The question is: is there a variable

Money

and variables responsible for purchased costumes.
How to save them when reloading the scene and can writing to a separate file help with this?

Answer 1

1) There are objects marked DontDestroyOnLoad
2) There are PlayerPrefs
3) At worst, you can use files

Answer 2

Static fields and classes.

public static int Money = 0;

public static class Account
{
    private static List<Suit> Suits = new List<Suit>(); 
}

Only within the runtime session, when the game is reloaded, everything will be reset.