A "new to me" Win10 machine will be arriving soon. I am used to running as "root" with the current machine so it will take some getting used to the login paraphanalia of M$.

What is the easiest setup to minimise this procedure?

What other measures should I take so that M$ is as least informed as possible? I have watched a youtube video about ensuring "cleanliness" of the OS.

How much hardware change can be made without running into issues? A second HD for instance so that I can run my preferred OS. I am loathe to remove Win10 as it may be useful "one day" ....

If the above questions seem strange bear with me as I haven't had a M$ machine since Win98.