Johnny.Decimal

• Documentation

  The system's user manual.

• Blog

  Working ideas and implementation notes.

• Support

  Help and everything else.

Systems

• Life Admin System (paid)

  A pre-built system to manage your personal life.

• Small Business System (paid)

  A pre-built system to manage any small business.

Johnny.Decimal University

• The Workbook (free with account)

  The original resource. Online, or download the PDF.

• The Workshop (preview)

  Walk through the creation of a system from scratch with Lucy.

• Task and Project Management (preview)

  Here's how I use my system to stay on top of life.

• Learn with Lucy – Excel (preview)

  A complete beginner's course to Excel.

• Everyday Obsidian (free with account)

  Tips for using Obsidian as your JDex.

• Online security essentials (free with account)

  The basics of staying safe online. Don't lose the 'hacker raffle'!

JDHQ

We refer to the parts of this site that are interactive as 'JDHQ'. There's lots more coming in 2026. See the video.

• Command-line tools

  Tools and tweaks for the terminal.

• Site API

  The HTTP API behind the jd CLI: build integrations against it.

• AI & LLMs

  LLMs love structure: here's how to help yours use your system.