[bonetm]

It looks like you're playing with one of the Edge Entertainment's edition (either Spanish or French), or Brazilian (from Galapagos, with the same card design as Edge's).

Those colors are totally artificial, and sometimes plain wrong, so it's best if you just ignore them and read the rules and understand what each card does and how it should be handled.

For example, any card with a Gold value is an Item. The rules say when you can play them, which kind of Itens you can carry (you can only have 1 Big Item in play, but as many smalls Itens as you like), that you can only trade Itens, etc.

So, stick to the rules as written and just ignore this colored code.