change display colors. which rule causes which color?

I'm having terminal-windows with dark backgrounds.

The problem is, that all dark blue colors are very difficult to recognize.

Ideally I'd like to change all dark blue vim colors into a lighter blue
or another color.


My Questions:

Is there an easy way to globally change one color with another.

Alternatively.

If I see something in a color, that I don't like.

Is there any way to place my cursor on the 'badly' coloured word and
find out which rule set the color for that word?

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