Knowledge is like a network.
When you learn something new, a new node joins the network. If that new knowledge has some links with knowledge you previously acquired, these nodes communicate. If not, the node simply stays there waiting for a new node it can communicate with.
The network is the most efficient when all the nodes communicate with each other, meaning when your knowledge deeply covers a variety of subjects which are linked with each other.
The stronger the initial network, the more difficult it will be for a malicious node to join the network. It will immediately be isolated by the other nodes.