Beginners try to animate every frame. Experts animate key poses and let the computer (or simple tweens) handle the rest.
Modern "easy" workflows rely on and Tweeing . Instead of drawing the arm three times, you draw it once, cut it out from the background, and attach it to a digital skeleton (a rig). You then tell the computer: "Move the arm from A to C." The software calculates all the in-between frames automatically. easy 2d character animation
Export as an or GIF . Watch your character come to life. It is that simple. Beginners try to animate every frame