Calculus, even the basics like derivatives, 2nd derivatives and integration didn’t really click with me until I did some scientific computing/signal processing

Calculus, even the basics like derivatives, 2nd derivatives and integration didn’t really click with me until I did some scientific computing/signal processing with SciPy and Pandas a couple years ago. Graphing the discrete versions on time series data, e.g. graphing the difference between consecutive values and seeing the derivative pop out, or a rolling sum for integration, etc finally made it all click.