Hey Guys,
I'm a little bit late in this discussion, but I got my 1st 3D printer a week ago, and wondered the same.
I finally found a great solution through the Cura "Calibration Shapes" plugin (you then get all calibration items you would need, such as retraction tower, retraction test, temperature tower, calibration cube, etc).
Everything is summarized in this CHEP video : https://www.youtube.com/watch?v=6LjbCIGCmd0