Why should I run sudo apt update before installing a package? Why!?

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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.
- thank you!
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
- thanks!
The god of penguins will punish you if you do not follow his will.

Tux has spoken.
coming from arch that's terrifying
If you don't, you can end up with dependency issues. Or at the very least you might install old out of date packages
- I have some dependency issues for sure
  
  We all need to apt update && apt upgrade our lives from time to time
Don’t ask. It makes things more exciting that way.

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