This is to activate windows, so if your windows is already activated you probably dont need it.
Anyway, essentially you run the script in powershell and select the activation you want, currently option 1 is the new one from this post and should permanently activate windows.
Should be safe afaik, i’ve read that MS employees themselves use this script if their own tools fail. I’ve certainly never had an issue with it, but again they could have installed some spying software and i would be none the wiser. Gotta pray the github wizards audited it for us