Love this intro! All of the popular dataframe oriented tools (tidyverse, pandas, etc) all require familiarity with vectorization and thinking with related mental models. I'm involved with Dataquest Labs and we teach data science interactively in the browser. We're pretty big believers in using diagrams and visual aids to help people learn these concepts as well.

We've had a pandas course (https://www.dataquest.io/course/pandas-fundamentals) for a while and we just launched some R courses that teach a lot of vectorization (https://www.dataquest.io/path/data-analyst-r).