>>Pro tip - safe mode
All well and good if you can get to safe mode without booting Windows 10 in the first place (I'm looking at you 'Secure Boot'). Oh wait, if you reset/power off the machine 3 times as it is doing the whirly icon it detects there is something wrong and lets you get a little further - which of course assumes you get a chance to see the whirly icon.
Once upon a time there was perfectly good way to get at safemode, which didn't rely on you spamming the power button, but it was removed as an improvement. Bring back my f8!
Windows seems predicated on the (misplaced) belief that it won't break before you can log in... shame the people who dream up these things don't actually live in the real world(tm).