Method 1 (Used in video):

curl -sSL https://install.pi-hole.net | sudo bash

Method 2:

git clone --depth 1 https://github.com/pi-hole/pi-hole.git Pi-hole
cd "Pi-hole/automated install/"
sudo bash basic-install.sh

Method 3:

wget -O basic-install.sh https://install.pi-hole.net
sudo bash basic-install.sh

Method 4:
Install from docker. See pi-hole documentation for that.