Installing 'pi-hole' on Raspberry Pi

My installation notes:

# download raspbian image from this URL: https://www.raspberrypi.com/software/operating-systems
# flash the image using "Raspberry Pi Imager"
# boot your rpi

# update the SW on your rpi first
sudo apt-get update
sudo apt-get upgrade
sudo reboot now

# setup prereqs for pi-hole
sudo apt-get install dhcpcd5 ufw

# assign static IP
dns=`grep nameserver /etc/resolv.conf | head -n1 | awk '{print $2}'`
if=`ip r | head -n1 | awk '{print $5}'`
router=`ip r | head -n1 | awk '{print $3}'`
ip=`ip r | head -n1 | awk '{print $9}'`
echo "interface $if"
echo "static_routers=$router"
echo "static domain_name_servers=$dns"
echo "static ip_address=$ip/24"
echo "# append the above 4 lines to '/etc/dhcpcd.conf'"

# get the changes into effect
sudo reboot now

# download pi-hole installer and run it
wget -O basic-install.sh https://install.pi-hole.net
chmod +x basic-install.sh
sudo bash basic-install.sh
# and follow the instructions ...