new to opencore and security questions

Hello, I'm new to Open core and had some question son security, where does open core download the MacOS from and how secure is it to use for home use?

I upgraded my old macbook and its working great but I'm nervous to log into the os with my apple id and enter my personal information without knowing what could be on it looking at my information.

Does anyone have any information on how secure Open core patcher is? Thanks!