Question re booting-only from MicroSD

I use an microSD card for booting, but an SSD for everything else. I have a couple of questions:

1a) Do updates change what’s on the microSD or is it stable?
1b) Am I right assuming that if updates do alter the microSD then that’s the only time it’s written to?
2) If the microSD card has been corrupted, can I just burn a new one & replace it without worrying about anything else?
3) Is it possible to move the boot image to the SSD while leaving all the data on the SSD intact?

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