Ask HN: How do you study back end without writing/touching front end code?

What are your methods of learning back-end development without ever touching or creating a front-end counterpart of a project.

Here are some questions that may set a guideline for the discussion: - What are your methods of writing and testing certain APIs or algorithms (e.g. rate limiters)? - How do you benchmark/stress-test your code? - Resources on how you can improve your back-end development skills?

Feel free to ignore the questions and answer in your own way.