Save a Serialized Class with PlayerPrefs

I need help with a tutorial that I saw on Youtube.
The tutorials shows how to save a serialized class as XML Code to a PlayerPrefs string in an unity class. The goal is to save and load variables from this serialized class from everywhere. Thus, it is a neat alternative to using many PlayerPrefs.

Nevertheless, I don’t understand how to use this in another class?

What are you struggling with? BTW - saving large amounts of data to PlayerPrefs is not advised as it’s limited in size AFAIK.