There are a lot of meanings for each card, but there is always an individual theme. So, take the Two of Spades/Two of Swords. The core meaning is refusing to see what's in front of you. However, there is a scale of meaning from negative to positive. So the worst meaning is cutting yourself off, descending into mental health issues, but the positive one is taking the time you need to work out the truth or to make the right choice. All tarot cards work this way. Think of it as a spectrum of meaning from worst to best.
Your job, as an interpreter, is to decide where on the scale the right message lies. That means using your intuition, weighing up the situation, and deciding which works most appropriately. The problem is that people want to be given the right meaning, but it takes a little practice and skill to read the cards accurately. As I mentioned in the article, "...if you take each keyword or phrase as a kernel of an idea, you should be able to build on it. Take into account the circumstances of the person asking the question. Try to combine the meanings of two cards to come up with a third. Use your imagination and tap into your intuition."