Level the bed = good prints
You need to go into the menu on the printer and find the function to level the bed. It will move up and to the center. You then take a small piece of paper and slide it under the nozzle. This will be the process. So you want to move the nozzel by hand to the back left, right and front. There are 3 little screws below the bed, they are to be adjusted while you are at one of the locations I mentioned. While sliding the paper under the nozzel, it needs to feel there is a bit of grip on the paper, so it slides freely, but you can feel it rub against the nozzel a bit. You adjust the scew to raise and lower the bed in small amounts to find the perfect amount so the paper slides under, but theres the “feeling” that the nozzel is rubbing on the paper.
Adjust all the screws needed and then exit and try the calibration cube again. Oh and you can add glue stick to the build surface to get a good hold on the bed. Glue stick must be dry after applied. I use a small handheld torch to lightly dry the glue stick. But you should try with just a level bed first and see if it sticks without glue stick.