Martial artists talk about "Secrets of Karate". Okinawans kept karate secret from the world until about 1900. Prior, all students swore oaths to keep karate secret. When taught to mainland Japanese, many secrets were not revealed.
Today, there are two varieties: basic karate & traditional karate. Most dojo teach the watered-down versions and even in the same dojo, many are taught watered-down karate while only a select few are taught the secrets of the grandmaster.