2.3 System configuration after Setup of Operating System

System Update

Update your system:

sudo bash
apt update && apt upgrade && reboot now

System configuration

Unique hostname

set up a unique hostname - especially, if you have multiple Pi's. for simplicity, i would suggest scannerNN - replacing NN with a number:

sudo hostnamectl set-hostname scannerNN
sudo nano /etc/hosts
hostnamectl

Timezone

Not mandatory, but i would suggest to set UTC:

sudo timedatectl set-timezone UTC
timedatectl

WiFi country

In case you want to use WiFi

sudo iw reg get
sudo iw reg set DE
sudo iwlist wlan0 frequency

you should replace above DE with your wifi country; check https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2

Localization / Languages

sudo dpkg-reconfigure locales

i would suggest to select en_US.UTF-8 as default language