> This is a fantastic article for intermediate beginners. On HN, everyone is a senior data scientist working with Spark and Keras and Tensorflow and deep learning.

Although there is a ML/AI selection bias in HN, there are certainly a lot of people on HN who fall into the intermediate/beginner category (there is a lot of demand for R tutorials which I have been working on), although I would argue that dplyr can legitimately be used at the advanced level. And certainly Keras/Tensorflow is overkill for common business problems.