How to install Minecraft Server on Raspberry Pi 4

Basic File System Setup.

cd - Change Directory to Desktop
cd home/pi/Desktop
mkdir - Make a new directory Minecraft_server

 cd Documents - Change to Documents Directory
 cd home/pi - Change to pi Directory
 cd .. -  Return one level up 
 cd / - Change to root Directory 

pwd - Print Working Directory Absolute Path

mkdir - Make directory

 mkdir rusty - Creates a directory named rusty
 mkdir Documents/rusty - Creates a directory named rusty in the folder Documents.