Quote - is there a good site where the math nodes are explained? 
i only found this site
www.castleposer.co.uk/articles/maths_add.html

I believe BagginsBill is writing a book on just that. I'm so far behind you Ice-Boy in this regard it ain't funny, but it's not keeping me from banging away at it. I'm finally getting to a point where experimentation is beginning to make a bit more sense, but apart from the node reference that BagginsBill provided with MatMatic and what you've found at CastlePoser, not much structured stuff seems to be out there.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks