Tools and Techniques
Draw.io is a popular diagramming tool that's used for making flowcharts, process diagrams, org charts, UML, ER diagrams, network diagrams, etc. It's been around for awhile, has a mature code base and is now available as an extension for JupyterLab too.
This is a solid Quora answer that offers an objective look at the strengths and weaknesses of Python and R. The historical background helps provide context and the concluding thoughts offer useful insights for deciding which to use, when.
This looks amazing. Pandas on Ray is a new library for distributing your Pandas workflows. It's super fast, scalable and can be implemented simply by changing a single import statement. This is being actively developed and will ultimately enable Pandas for use in cloud environments.
This is a nice collection of exercises to help develop your NumPy skills. It's organized into 4 levels of difficulty and the solutions are easy to show/hide.