Setting up an alias in linux is very easy and very helpful. It allows you to determine a short phrase for running a longer command. Or change a common typo to the command you meant.
Here's an example alias:
\$ alias lsl="ls -la"
This maps lsl to the command ls -la which is half the length and since that's a common command that'll help out.
\$ alias h='history'
This shows the history of the terminal session.