the Arch wiki has some info. Not too sure but i think enabling the systemd timer is enough.

why do you say apt is the worst pm?

There are many instances. you’re free to choose one in particular(maybe one specialized in your language or hobby or country) or just go with one of the big ones like mastodon.social. See https://joinmastodon.org/servers

Yes you can subscribe to lemmy communities and new posts will appear in your mastodon feed.

lspci -k might help

Same here but i’m afraid we’re not really in the majority.