From our atmosphere to the very blood that runs in our veins, fluids are everywhere and are essential to life. The study of fluids in motion is called fluid dynamics, and engineers rely on it to design and optimize engineering applications. The principles of fluid dynamics enable engineers to design rockets that carry humans into space, to cool high-performance electronics, to power our cities and many more critical engineering applications. In this learning track, we will start by answering the simple yet enigmatic question "What are fluids?" We will then proceed through courses that incrementally add sophistication and build a foundation for learning the fundamentals of fluid dynamics. This learning track is a precursor to more advanced topics that can further your insight into fluid dynamics.