Does anyone know of a Cross Reference list of the versions of Visual Studio on Windows and XCode on MacOs that work together?

I'm a retired software developer. I want to create apps to use on my iPhone for my own use. I have one of my old iPhones, that has been reset, that I want to set up so I can use it for testing and occasionally use the internet, no cellular use. Cellular is turned off. When I go to set it up, it wants me to login with my Apple ID. I don't want using this phone to hose up my active iPhone. I have a couple questions: If I sign-in the Test iPhone with my current Apple ID, will it screw up my active iPhone? Do I need to have a different Apple ID to use for development? Reading other posts, it seems this Test iPhone has to be active? What does that actually mean?