Very good question. There's not a whole lot of clear documentation on this, but my understanding (which could absolutely be wrong) is that the Support Training (non-Tier 1) is for those users who are providing their own direct support to faculty/staff/students, and the Tier 1 is for those that have signed up for Tier 1 support - meaning Canvas provides Tier 1 support for your faculty/staff/students.
So the non-Tier 1 course focuses on resources such as documentation, videos, and then how to file actual bugs with Canvas, and the Tier 1 is the same plus how Tier 1 works and ticketing with them.
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