Use a cutting board and a very sharp knife, or a special cubing gadget. All you do is follow these divisions, pulling at them gently with one or two forks. Or flake with your fingers. Means to put food through chopper.
Choppers have two or three blades.
Julienne Means to cut potatoes or vegetables into matchlike sticks. Means to cut or tear in long, narrow pieces. Means to cut or splinter into long, thin strips, with a sharp knife on a cutting board.