Recently I have been baffled by gradient, divergence, and curl. All of these include partial derivatives. Although I am comfortable with gradient, I am still wondering what divergence and curl are useful for. More importantly, I am still unaware of how their mechanism connects with the partial derivatives. Here I am sharing useful resources on these topics.
Photo by NASA Goddard Photo and Video 
On Gradient, Divergence and Curl by Psyops Prime is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.