You'll learn to recognize how different start settings look in the timeline.
Effects with this setting line up evenly at the same starting point unless you apply a time delay to any of them. In the figure, they have the same end point because their speeds are the same. If time delays were set, the starts would be staggered, as in the duration examples shown in the preceding sections.
Each duration with this setting starts neatly after the previous duration ends. The timeline indicates an effect that starts After Previous with a thin vertical bar connecting the end of one duration and start of the next. With this setting, you cannot drag a start time to begin before the previous effect ends.