3D Printer Basic Calibration

How to level and calibrate your printer:

Your print bed may become loose after a few days of printing, and this will affect the first layer and may cause prints to fail. You should recalibrate your printer after a few days or if the first layer is not printing properly.

Key points:
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Clear oozing filament on the hotend before leveling!!!
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Use printer paper to test leveling, other types of paper may have incorrect thickness
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Change bed height until you "feel the drag". This requires practice, you should feel the drag from hotend while moving the paper without too much resistance.
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Print our hybrid layer calibration (both 1st and 2nd layer) gcode after paper leveling or whenever the leveling feels off. Adjust the bed height until the calibration test is printed perfectly. Now you have the perfect leveling.

The first picture is what this print should look like if the leveling is too low

The second picture is what this print should look like if th