I happened to stumble upon on one of the videos from Missing Semester series from MIT on YouTube and ended up almost binge watching the entire playlist. These are lectures from a group of PhD students at MIT. It turned out to be a great refresher on many different topics. There were quite a few aha moments where I thought how did I miss finding that this long, especially on some of the topics under Command Line Environment, Vim and debugging. Though the concepts were quite familiar, I kept learning something new in every lecture. Kudos and thanks to the presenters Anish, Jon and Jose for making this available on YouTube.