Computer hand-drawing can achieve the effect that we can't do on paper. But paper has an aura that computers can't draw. Before learning computer hand-drawing, I hope you can learn the basics of art well, keep your hands steady, and grasp the structure, perspective, projection, proportion and dynamics well, otherwise you may not learn well for a long time. Then buy a hand-drawn board and find some line drawings to copy first. This kind of thing is gradual, and it is impossible to achieve it in one step.