Question: in the related content section you want to talk about...
In the related content section you want to talk about what the concept is related to. For example, fluid is related to water, hydration, sodium balance, volume.
In the underlying principles what is important to know about the concept you’ve chosen. For example, fluid is regulated by sodium.
And lastly nursing intervention. You want to reinforce the information collected in the related to section and the underlying principle.
Based on the fact fluid is related to sodium balance and that balance regulates the amount of water in the body, an appropriate nursing intervention is: assess sodium level.