Node shapes and colors

When node editing, I see different shapes and colors of nodes displayed. When closing a shape there seem to be a different shaped node for each line end. I have searched for some description of these features and found none. Is there a detailed discussion of these features available?
If there is none, would someone be kind enough to write one please?
Also, sometimes I connect two nodes and they do not join. How can I find out why something so simple doesn’t work from time to time?

I also would like to see a node legend, nodes not connecting for me usually means something not closed elsewhere or different layer colors. Last resort work arounds, copy and paste then start deleting line segments, also offset can get you out of a jam. when editing i like to copy and paste and always save.

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