What does it mean that relationships are as important as entities?

The connections between things carry as much meaning as the things themselves.

Example: You have notes on 'working memory,' 'cognitive load,' and 'externalization.' Separately, they're three isolated facts. But the moment you map the relationships — working memory limits cause cognitive load, externalization reduces cognitive load, reduced load frees working memory — you've built a causal loop that none of the individual notes contain. The insight lives in the edges, not the nodes.

Try this: Pick five concepts you've captured in your knowledge system. Write each one on a separate card or line. Now draw every connection you can identify between them — label each connection with a verb: 'causes,' 'enables,' 'contradicts,' 'supports,' 'requires.' Count the relationships. You should have more relationships than entities. If you don't, you're missing connections.