You can probably recall a bunch of stories, television shows, movies, etc. where some character is on a journey. And on that journey, they come across a fork in the road that seems to lead into multiple directions. That one spot the character is in – the center of it all – branches into different pathways on where to go.
The same thing appears in music, as chords have multiple functions and various chord quality overlaps in different keys.
For example: If I play a C major triad chord, what would come next? Or better question; what key are we in? Because, a C major triad appears in multiple keys – all with different harmonic functions.
Below is a “cheat-sheet” of common chords found in music and the possible diatonic harmonic functions found in various keys:

Experiment, and see where it leads you to!
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