The terminal, navigation, files, pipes โ the ground everything runs on.
Every Python tool, every Git command, every package manager, every deployment script runs in a shell. If you don't understand the environment your code lives in โ paths, redirection, processes โ you're flying blind. Phase 0 takes four weeks to make the terminal feel like home so that when Phase A starts, the shell is already second nature.
Read the lesson on your commute โ open Terminal on your Mac and run through the commands by hand โ do the /learn T1 exercise with Cody โ tackle the flaw drill at the end of the week โ mark complete and move on.