For those who have defined/overridden many shortcuts, there are many free apps that can show all the short cuts (Such as the Cheatsheet app). This paid app Keycue (from Ergonis) is expensive but really nice. E.g., it can highlight all shortcuts according to the modifier key/s you enter in the search field.
Just FYI.
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Indeed! Ergonis makes god software in general too 
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- it’s just that good!