It is a lot to ingest. Can you elaborate on the OpenStack development you are doing?
OpenStack refers to a number of different projects (Nova, Neutron, Horizon, etc). I would advise getting a high level understanding of how Nova, Neutron, and Cinder/Swift interoperate. Then drill in to Neutron. As with every other cloud platform I've worked with, most of the IaaS complexity lies in Networking, in my opinion. Neutron, and SDN in general, is a fairly complex topic depending on your experience with network architecture and administration.
OpenStack refers to a number of different projects (Nova, Neutron, Horizon, etc). I would advise getting a high level understanding of how Nova, Neutron, and Cinder/Swift interoperate. Then drill in to Neutron. As with every other cloud platform I've worked with, most of the IaaS complexity lies in Networking, in my opinion. Neutron, and SDN in general, is a fairly complex topic depending on your experience with network architecture and administration.