Shoden is a Japanese word meaning 'first teachings'.
It is the first level of teachings in the traditional Japanese branch of Reiki called Usui Reiki Ryoho.
Energy is a word that very few people can explain in all its complexities. You could read a book on it or be told all about it but it is the actual experience itself that teaches you.
Therefore a complete treatment is given and received by each participating student and many hands-on exercises are used in a group environment during Shoden. This practical experience leads to an inner understanding of energy.