I always found it was best to learn from someone who has been there, done that. There are invaluable lessons to be shared here through the people who experienced it. Books only get you so far. This is how I learn.
Learn from Blue Teamers – A collection of blogs and write-ups from blue teamers in various ccdc regions.
Learn from Red Teamers – A collection of blogs and write-ups from red teamers in various ccdc regions, including debriefings from the different regions.
Learn from Coaches – Coaches are a valuable asset and are part of the team just like the competitors.