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The colours mean the type of system (Scientific, Mining, Manufacturing, etc) and has nothing to do with the wealth of the system which you can read in the Galaxy map if you build an economy scanner.
If you want an easy (perhaps too easy) guide to trading then go to the Guide's section here on Steam for this game and look for a Trading guide by ColorsFade (edit: correct user name)
https://steamcommunity.com/sharedfiles/filedetails/?id=1593699342