Install F-Droid -> install Aurora via F-Droid -> install whatever you want

Also if installing potentially untrusted/corporate apps on Android consider using Insular (Island) to clone and run them in a sandbox so they don't have access to your personal/primary account data.

I also recommend adding the IzzyOnDroid repository, and using NetGuard to isolate applications from network services. NetGuard simply creates a fake VPN entry point that goes nowhere - if you don't want an application to talk to anything outside of your device you turn on NetGuard for it and any outbound traffic gets dumped into a black hole - it's an excellent piece of software. You can even do this to built-in Google applications and various pieces of Android itself, so they never send any data out.