You want to know what the store actually has in stock before buying.
actually, every morning I wake, I update first thing, so I guess, I found it somewhat useless
You don’t have to do this. Run something like apticron if you want to make sure you don’t miss security updates or want everything on the latest version all the time.
It’s not necessarily required but it is strongly suggested in case the package you are installing requires the latest version of a dependency.
It updates the package lists APT uses. You don’t have to run update before installing. But you could be installing the previous version of the application. For instance if you never run update, the upgrade command won’t do anything.
Edit: spelling
The god of penguins will punish you if you do not follow his will.
Tux has spoken.
coming from arch that’s terrifying