Linux has come a long way over the years. Nearly every variant has a software manager, a graphical interface for adding software. Why bother with the Terminal any more?
First, the terminal will display everything it does. Second, there are many versions of Linux and all of them have Terminal as an option. No matter what version of Linux, Terminal experience will server you well.
Here is a quick example of how to install GIMP using the Terminal.
sudo apt-get update && sudo apt-get install gimp
The && combos two commands, update and install. The first checks your repositories to make sure they are up to date and the second installs GIMP.
You can follow this with autoclean and clean:
sudo apt-get autoclean && sudo apt-get clean
These commands remove .deb files not used by your system. Autoclean removes the cache information. This is good for systems with low disk space, however the penalty is you will need to download these again if you need to update or install software.