I'm using zsh on a mac.
Always update the docs/COMPLETE.md document with what you did, and add any appropriate followup ideas to docs/TODO.md
Store any useful knowledge that you might want to refer to later that are specific to this repository in docs/KNOWLEDGE.md
Store top level knowledge about the design in docs/DESIGN.md as you go along
Store a working PRD in docs/PRD.md as you go along.