This book makes a very complex subject easy to understand. It starts from the very basics descibing each of the commodities and types of energy then goes onto describe there general uses giving you good background to the markets and who uses them. Its goes to the technical stuff of the markets tryin gto make as easy to understand as possible, using lots of graphs and flow diagrams. Avoids the tedious aspect of a lot of financial book by using short expalinations and lots of diagrams and graphs.Also goes in to quite a lot of detail with getting bogged down with long explaination. Enjoyable read.