Wargames can help you to learn and practice security concepts through games
Reading the title and before I saw the link, I thought this was referring to games like Armored Brigade or Red Dragon (always be reconning, find a weakness to exploit, execute, or conversely stop enemy recon and conceal your weaknesses). Both kinds of wargame require a similar process to be successful, even though OTW's wargames are more relevant to computer security (and a great place for beginners to start! Highly recommended).