Since I cannot send you a direct PDF file, I have written a comprehensive, plain-English article below that covers the basics. You can copy, paste, and save this as a PDF for your personal use.
Dummy takeaway: If a fluid is standing still, remember: deeper = more pressure, and anything that pushes down must be pushed back up equally.
tucked away in the back of the local library. As he opened it, the pages began to glow, and he was suddenly transported into a world made entirely of movement. The Three Kingdoms of Flow
Key Concepts in Fluid Mechanics