N.B. The screenshots and descriptions are for the iPhone/iPad version.
Tasks are the repetitive jobs to be performed around the yard — cleaning water troughs, cleaning tack, sweeping aisles, restocking hay etc. They are separate from the Lists module, which is horse-oriented (who rides which horse today). Tasks are yard-oriented and typically recurring.
Each task can be:
Tasks can be assigned to a particular person, and marked complete once done. A warning period tells you when a task is coming up soon.
The list of tasks is per-stable — each stable defines its own set. If several tasks look similar, that's fine; make them as specific as suits your yard's routine.
Not sure if you want a task or a list entry? If it involves a specific horse (ride, lunge, walk), it belongs on a List. If it's a yard job that could be done by anyone at the stable (clean troughs, sweep, restock feed room), it's a Task.