4 can be insanely difficult. To me it’s nearly impossible to even set a clear set of generic principles without acknowledging the wide array of particular situations of a particular household.
That’s right, household. It’s not just YOU who needs to do stuff.
Let’s say it’s you remote working, your spouse remote working, a couple of small kids and generic lockdown so you can’t have babysitting.
Good luck keeping a schedule between changing diapers and bouts of crying. If you have a reasonable sized house you might have room for a dedicated office that can be reasonably quiet but what if you don’t?