Harmonic Cadences are like punctuation at the end of a musical sentence.
Harmonic Cadences Explained:
https://www.earmaster.com/music-theory-online/ch05/chapter-5-6.html
Audio Examples of Cadences
http://www.gmajormusictheory.org/Listening/cadences/cadences.html
Cadences w/Examples of each:
https://musictheorysite.wordpress.com/2015/07/02/cadences/
Cadences with Audio Examples Included (piano)
https://music.tutsplus.com/tutorials/an-introduction-to-cadences--audio-3325