To go to root directory(Home Folder)
[~]$ cd
To go to a specific directory
[~]$ cd directoryName
[~]$ cp sourceDirectory destinationDirectory
[~]$ mkdir directoryName
[~]$ vi fileName
Press ESC and type :wq to save and quit.
[~]$ rm -r directoryName
[~]$ rm fileName
[~]$ ls
[~]$ mv sourceDirectory destinationDirectory
[~]$ rmdir directoryName
[~]$ mv oldFileName newFileName
Reference manual which gives list of options
[~]$ man ls
More descriptive user guide
[~]$ info ls
Short description of its main options
[~]$ ls --help
[~]$ less fileName
Press q to quit.