Animation strips look like little grey bars in the module editor’s [?]
The "Module Editor", also known as the "Visual Editor", is an interface used to create & modify modules.
It's through this interface you can add various types of layers to your modules, as well as animation and special FX. timeline [?] The timeline is the section of the module editor dedicated to animation and controlling the stacking order of layers.
From this part of the editor animations can be added, adjusted and previewed. Additionally, layers can be selected from the timeline, and can be dragged and dropped up and down on the timeline to modify which appear in front and which behind.
It can be equally compared to both a timeline in a typical video editing application, and a layers panel in a typical graphic design application:
A strip represents something about a layer [?]
Layers are containers for visual, audio or layout items and are added to slides. For example, text, button, image, audio, video, group and row are all types of layers.
Layers are added to slides via the module editor. changing over time, animating the change along the way. For exmple, a strip might animate a layer changing from being completely transparent to fully opaque.
The width of the strip determines how long the animation will run. The wider the strip, the longer the animation will take to complete.