I guess a good way is a combination with reading material / books etc. And then hands on experience trying out various SOA products and implementing some SOA projects.
SOA is a overloaded and broad term. So its not really confined to a single product / technology etc. So its hard to say when something is SOA or when its not.
You can say the FuseSource products can be used in a SOA infrastructure.
Good luck with your studies.