Hi @crystaln 
Welcome to the Community!
I would echo @jailynnlucidday and @PolishedGeek in suggesting the Status column for tracking the priorities of tasks.
As @PolishedGeek mentioned, you can use the settings of the Status column to define which label should indicate a completed task - you can select multiple labels if needed.
Alternatively, you could look at using a Number column and having numbered priority levels (i.e 1-4).
This would then allow you to create a hierarchy of the priority levels, which can be used for sorting tasks within boards or dashboards too 
I hope this helps! Remember to mark as solved if this answers your question!
Best,
Dani