Ubuntu terminal command practice

I learn and practice with this.

pwd command is an abbreviation of ‘print working directory’

1.1)

cd command is an abbreviation for ‘change directory’.

2.1)

The current working directory is the directory in which the user is currently working in.

2.2) cd ~/ or cd means 'change directory to admin directory'

2.3) cd / means 'change directory to root directory '

2.3) cd .. means 'back to outside directory ' and cd ../.. mean 'back 2 time'

whoami is command for show your current username.

3.1)

ls is command for showing list of item in directory.

4.1)

4.2)" ls > Text.txt " mean making file (you can add path like something..../ Text.txt )