No password Startup - Debian Rock 3C

Hello,
I’m having trouble making the system active automatically.
I would like to use the ROCK3C as a server, running a script every time it turns on, and listening to SSH for remote access always.

If the power goes out, it should automatically restart.

Is it possible to implement these settings in Debian? Or should I change the OS to Ubuntu?

How do I remove the password login screen?

How do I activate SSH automatically without having to type the login password on the keyboard?

How do I run a script at startup (after all services have started)?

Forgive me for asking so many questions, but I’ve been looking for this for a week and have been having trouble solving it. I managed to do this in Ubuntu, but I can’t do it in Debian.

I hope you can help me.
Thank you.