You will learn how to animate at fast, medium, or slow motion speeds. In stop motion animation, spacing between pictures determines the speed which your props move.
Since the frame rate never changes, a stop motion animator needs to know how far to move their props between pictures. Move something a big space between pictures, it animates fast on playback. Move something a tiny bit between pictures, it moves in slow motion. Simple as that.
Why Is This Important?
The most common error a beginning animator makes is getting spacing wrong. Spacing affects every animation you will ever do, so learning how to create the illusion of fastness or slowness with spacing strategies is one of the most basic animation skills.