I am migrating to a new mini mac. Will it also transfer any virus from my old one?

Yes, Ronasara left out the "cannot".

There are currently no viruses that affect macOS in the wild. There are certain kinds of malware that can affect Macs but Apple has very robust protections. The biggest threat is that you would be tricked into installing something harmful.

See this article:

Effective defenses against malware and ot… - Apple Community

While there are reasons you might want to manually copy data and reinstall programs, this isn't one of them.

Yes. Best to manually copy user data and re-install programs.

To b clear, Macs cannot get viruses. They have their own built in antivirus and specifically, the operating system is write protected, so it can to be overwritten or infected.

Yes, thank you for correcting me.