Are all Japanese cartoons made by computers now? So how can we learn to make cartoons with computers?

It is made by computer, but before making it, the animator needs to draw the original painting, color and many other complicated processes. Animation is actually two original paintings (the original paintings are two continuous moving pictures drawn by the animator) (the principle is similar to MAD, and it can also be considered as the number of frames). However, drawing the original painting needs to pay attention to many problems, such as composition, smooth movement, nature and many other aspects, so it takes time to draw only the original painting, and it is even more difficult to draw when encountering difficult fighting scenes. So it is very difficult and boring to do it by one person. Generally, animation studios or companies make them together.