Hardware: either
- use whatever you have lying around, e.g. an old laptop, or
- get a used thin client like e.g. a Dell Wyse. (passive cooling = no noise)
A Raspberry Pi is needlessly expensive for self-hosting, since it comes with GPIO pins etc. for controlling custom electronics.









Roughly from high level to low level:
Best apply the methods arbitrarily, so that you get even more confused about how you might restore access to a given website.
Options 5 and 6 may be the only viable ones for locking down certain smartphones or tablets.