How save and load global variable?

How to save global variable. And when you click on the continuation of the game, the global varible became was loading.

Look at this other post

This saves a Global variable named high_score in Storage so when you quit the game the data persist
At Begin of the Scene high_score is 0 on new game move a character to increase high_score then hit Save button and quit the game or click back and you go back to Main Menu and the high_score variable will show the last High Score saved.