The potter I chose is Dara Green.
She is creating a ceramic bowl on the wheel. In this specific video, she trims the foot of a bowl.
Line up your leather hard bowl, rim down, as best you can with the guiding circles on the wheel. Spin your wheel slowly, and place your thumbnail lightly against the bowl, towards the top. Hold your thumb in one spot, and see where it does and doesn’t touch the bowl. When it doesn’t touch a certain area, move the bowl in the direction of that area. Continue doing this until your thumb is touching each area as the bowl spins. Now break a piece of clay into four pieces, and roll these pieces between your palms to make cylinders. Secure the bowl to the wheel with this clay. Take your trimming tool and skim the top of the foot using the long part of the tool. Then tilt the tool sideways and trim the side of the foot. Now round out the “shoulder,” or part of the bowl leading up to the foot. Stabilize the tool with both hands, and make the foot ring using the point of the trimming tool. Then trim away the center of the ring. Create a 90 degree angle between the inside of the foot ring and the top/base of the bowl. While you hold the tool in one hand, stabilize with a finger from your other hand. Smooth out any sharp edges. Take a damp sponge and go over the bowl to finish it off.
Next time I trim, I will try to make the inner foot ring a 90 degree angle, and I will try smoothing out my bowl with a damp sponge.