For anyone new to 3d printing this is a very beneficial guide and easy to understand. Don't ignore how important this step is. Just do it and you'll be happy you did. It will make your first printing experiences much more pleasant. I think most new printers are pre-calibrated and even kits like the Makerfarm i3 are really, really close right out of the but, but anytime you can eliminate a culprit and know definitively that something is NOT the cause of an issue, then life is better. It's better to know your extruder is behaving instead of just assuming.

I did the same calibration steps using another guide but felt like I needed PHD to even understand it. I did wind up with great calibration but this guide makes it nice and simple.