INstallation - owners ship comands before install - questions

I started running the commands and noticed that I did not have a cache folder. So, the command reminded me.
sudo chmod -R 775 cache custom modules themes data upload
Do I need to create one?

In addition, I do not have the file that seems to be named in this command:
sudo chmod 775 config_override.php 2>/dev/null

Is that OK?