A key principle in creating your personal book of knowledge is to create connections.
Connections allow you to find the information in the future.
Connections allow you to discover new connections and new ideas.
Connections give your PBOK structure.
Connections compound the value of the knowledge in your personal book of knowledge.
Remember, the world wide web at its core is based on connections. It is what allowed it to explode into what we simply call the internet today.