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Change to a directory
cd 
Example -  cd /usr 

Move up one directory from your current directory
cd .. 

Check your current path:
Pwd
 

Listing files:

Show the contents of your current directory
ls 

Show the files in long format i.e. the owner of the file, rights etc. 
ls -l 

Show hidden files
ls -a 

Show sub-directories
ls -R

Display the contents of a file on your screen with the ability to scroll up and down.
less 

Display the contents of a file but you can only go down not up and only with the enter key.
more

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