In this lesson of learn free music theory, I cover dotted notes and triplets. CORRECTION! Where it says "duple" in this lesson it should say "simple". I'm building a Planet of Piano for people like you, come discover it: https://pianoplanet.app
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Andrew Furmanczyk :: https://howtoplaypiano.ca

This is why:
How many beats per group? ( Simple or compound)
Simple = groups of 2 ( 1 2 ) ( 1 2) ( 1 2) etc
Compound = groups of 3 ( 1 2 3 ) ( 1 2 3 ) ( 1 2 3) etc

How many groups per bar? (Duple, Triple or Quadruple)
Duple = 2 groups per bar |(group) (group)|(group) (group)|
Triple = 3 groups per bar |(group) (group) (group)|(group) (group) (group)|
Quadruple = 4 groups per bar |(group) (group) (group) (group)|(group) (group) (group) (group)|

So 6/8 is Compound Duple time ( 2 groups of 3) ( 1 2 3 ) ( 4 5 6 )
My original mistake in the video was swapping simple and duple terms.
So as convoluted as this all sounds, it's actually really simple stuff, just using more complicated words than necessary. Really sorry for the mistake!!! :(