I really like the promotion of Cisco DevNet in this blog by Susie Wee. As a recent DevNet Member, learning Software Defined Networking, Containers and other topics related to programmability, I have found DevNet to be a highly useful resource. The best thing I find about the interface is the selection of training topics based on tracks, modules and labs. I have followed the Network Programmability Tracks and learnt Python Scripting for REST API calls for Spark, and with the practical scenarios and guidelines, it was very easy and straightforward to learn quickly about relevant SDN technologies. I would highly recommend DevNet as a learning platform for all levels of expertise, who are interested in learning emerging technologies.