Oh! Speaking of command line and the basics, this one from MIT is amazing. Covers all the basics.

The Missing Semester of Your CS Education - https://missing.csail.mit.edu/

Contents: Course overview + the shell, Shell Tools and Scripting Editors (Vim), Data Wrangling, Command-line Environment, Version Control (Git), Debugging and Profiling, Metaprogramming, Security and Cryptography

I really enjoyed the course on the Science of Exercise - https://www.coursera.org/learn/science-exercise.

I always wondered if there was a comprehensive way to understand how different fitness regimes and diets actually help or don't help. This course was amazing and helped my understand the fundamentals. A bit technical - goes into the basics of biology, but even without that information, this was a great course. The instructor is Dr. Robert S. Mazzeo, who has been studying, researching and teaching in the field of exercise science for over 40 years.

I have actually applied several of the principles in my workout regime and started to see the effects over the last few months. I highly recommend this one.

Not sure if I'll follow through on this but this was a great recommendation as I had no clue of its existence. Thank you very much for taking the time to recommend this and exercise science is a budding interest for me.