People usually tell you that a good way to learn to read cards is to pick one a day or one a week, and think about what it means, keeping your ideas in some sort of Journal.
It sounds like a good idea, but I could never make it work. I’d try and try, and feel guilty that I wasn’t doing it right.
However, the exercise discussed here encourages you to think of a question first, and then pick a card – or rather to keep picking cards to answer the same question. It’s a lot easier because you now have a context in which to understand the card.
The audio file is a bit under 30 minutes long.