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Long-form field guides for working techs.

Full-length books written for people who actually turn wrenches. Free to read. Each chapter is a standalone study session — read one at lunch, work through the whole book over a season of prep.

The ASE Codex cover
Book · J.Wilder

The ASE Codex

A Field Guide to the Certification, the Craft, and the Career

The definitive free field guide for automotive technicians preparing for ASE certification. Thirty chapters spanning the history of ASE, the neuroscience of studying, every Automobile series (A1 to A9), plus surveys of the truck, collision, and service consultant credentials, closing with the craft, the career, and reference material for the bay. Written by working techs for working techs, mixing shop-floor voice with textbook rigor.