Documenting Architecture
How to communicate an architecture so it survives contact with a real team — a few living, versioned diagrams and decision records instead of a dead 200-page tome nobody opens twice.
Communicating architecture so it survives contact with a team: the C4 model's zoomable levels, diagrams-as-code that live in version control and don't rot, multiple views for multiple audiences, and just-enough living docs plus ADRs.