Learn Linux : 10 simple commands to get started
The idea is to start with something simple enough to make you want more.
Think of a command as the answer to a question.
For instance, the question ‘How do I create a folder called “test”?’ has the answer “mkdir test”.
Commands you can run without parameters
(that is, you just type the command)
Commands you can run with 1 parameter
(that is, you type the command and some details about who the command will apply to or some options for that command)