Pinching is the most ancient hand building technique to create a simple pot from soft clay. This will also be what you learn in your very first class of pottery.
After you prepared a clay, you'll hold a ball of clay in one hand. The size of ball has to fit your palm nicely so that you have bette control over the shape. Then you press a hole in it to create an opening, then continue to slowly rotate the ball as you squeeze the wall to create a container form. It can be a V shape, U shape and irregular form of your choice.
It is always good if you have a shape in mind before your begin but as you started to work on the clay, you'll notice that it's every easy for the clay to take its own direction. That's also the fun part of pottery.