A short chord progression plays, you name the cadence. Cadences are the punctuation of music: hearing whether a phrase closes, pauses or surprises you is key to understanding form and harmony.
Level 1 asks you to tell an authentic cadence from a half cadence. Level 2 adds the plagal cadence and level 3 the deceptive cadence. From there the four cadences stay in play and the difficulty comes from telling them apart more reliably.
Both end on the tonic, so listen to the chord before it. The dominant (V) pulls strongly toward home, with a leading tone rising a semitone; the subdominant (IV) arrives more softly, the classic 'amen' sound.
It sets up the same expectation as an authentic cadence, then lands on the minor sixth chord instead of the tonic. If a phrase sounds like it was about to close but slipped somewhere darker, that's the one.