I would imagine that you’d still be able to use Heroic for GOG

I haven’t personally hosted it myself but I’ve heard it’s pretty good, also worth vouching for KeePass based on my time with it

Bitwarden offers this feature for free using custom fields, although 2FA is paid unless you self-host IIRC

Sounds like a skill issue

nothing more fun in school than when me and the rest of the class had to constantly deal with slow windows laptops with battery lives that lasted about an hour or sometimes less, locked down so much that you couldn’t change a single setting except resolution and i wish i was exaggerating