You usually have a lot of free time next to your studies. How you divide that time is of course entirely up to you, but it largely determines how much fun or less fun you will experience your study time.
A part-time job can not only be a solution for some extra money, but often you also make nice friends at work, and you meet people you would never see otherwise.
At the moment almost every company is looking for staff, so it shouldn't be difficult to find something suitable, but we've listed some useful sites below.