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“Something has gone seriously wrong,” dual-boot systems warn after Microsoft update
(arstechnica.com)
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Provided your CPU has virtualization features (described here) then the performance overhead for virtualization is negligible. So very probably you'll be fine.
The memory requirements for virtualization is not negligible.
That depends, if you're going to run a barebones W10 install with what amounts to a word processor I think 2GB should be enough. If you can run Chrome you can run a VM. 4GB if you're feeling generous, that's a fair compromise as compared to the disadvantages of dual booting.
I remember trying to push the limits with a Windows 10 VM, and 2GB was the bare minimum;
however, Windows loves to abuse virtual memory (basically using the main storage drive instead of RAM) and if that drive is a HDD the PC is little more than an IoT space heater.
A relative of mine has a Windows 10 PC with 4GB of memory and it takes ~ 5 minutes to start Chrome after booting it up; it does have a lot of miscellaneous bloatware on it, though.