OpenFlow Resources
Although we have a large number of tutorials, it is recommended that you familiarize yourself with the OpenFlow protocol if you are planning to develop and SDN application on Floodlight that directly uses protocol features, such as installing flows, querying switch statistics, etc.
There are lots of good OpenFlow primers and tutorials on the Internet, just a search away. If you're interested in technical details though, your best option would be to peruse the OpenFlow specification documents. Although the specs are long, they are well-written and contain everything you need to know about the OpenFlow protocol.
Flowgrammable is also a recommended resource for learning the OpenFlow protocol. It presents the same information as appears in the spec but in a more graphical manner.