Basic use of variables in PowerApps
The logic of PowerApps is not focused on variables at all - it prefers direct connection of items or use of database. But from 2017 the "classic" variables are supported. So how to use them?
How to create / change variable?
Set the OnSelect property of some item (probably button) using Set function, like this:
Set(x,10) - pressing of button changes the value of "x" variable to 10
or like this:
Set(x,x+1) - pressing of button increase the current value by 1
How to show the variables value?
Write the name of the variable to some items Text property:
How to control them
The variables and their values can be seen in File / Variables: