Sorry if my writing seems like scribbles, I am not a native English speaker.

Would that work? I will try, thanks

Yeah but is Nix OS going to provide easy to use persistence volume manager in its live mode?

It seems even I have many many many things to learn still

Yes, all of that is persistence storage.

When you boot, if you choose to use persistence storage by unlocking with password, etc, all your settings, installed app, etc get loaded from it. If you dont, the distro default is set.

If you have used Tails OS, its exactly that, except not hyper focused on anonymity and security requiring Tor to be running to access the network

That and making it easy to store settings, passwords, bookmarks, etc, almost how Tails does it

Next up: Learn how to create .service file, you may be able to use it from the template provided.

Then learn about target and unit

Find these on Youtube