Unit 5
https://www.toppr.com/guides/physics/force-and-pressure/introduction-to-pressure
This site does a nice job of explaining what pressure is. It provides formulas, types, and examples as well.
https://people.howstuffworks.com/water.htm
Have you ever wondered how a water tower works? Well, this article is just for you then! It provides an explanation of how the towers work and the importance of them. They also give graphics to help the reader follow along with the explanation.
On this link, it gives a worksheet that students answer questions from an experiment that will help them learn about the hydrostatic paradox. I think the experiment could be beneficial to students and think it will do a good job of helping students understand this complex concept.