What is Pi Apps
Pi Apps is a collection of app installation scripts that cn be run with one click. It was developed because there is no centralised software repository except for the apt repositories which are not user-friendly and in some circumstances can break your device's operating system
This is where Pi-Apps comes in and hosts over 200 apps
The Pi Apps Official guide is here
wget -qO- https://raw.githubusercontent.com/Botspot/pi-apps/master/install | bash