Is is crucial that I know the basics of VBScript or JScript? Or will it suffice if i only know the basic idea of coding and how syntax usually should be read?
For example how would I fetch the folder sizes of all subfolders in a folder?
You'll definitely need to understand VBScript or JScript to write a script, especially one involving caching data and using the cached data lately, which isn't trivial.
Opus provides a helper for enumerating folder contents:
Guess I'm way in over my head at this moment then. 