How to Be an Adult is a free, comprehensive guide to the practical skills that adult life assumes you already have and almost nobody is formally taught: how taxes actually work, what a deductible covers, how to read a lease, what a credit score is and how to move it, how to negotiate a job offer, what to do about a medical bill you cannot pay, how to cook, how to keep a car running, and how to handle the bureaucracies that hold all of it together. Its founding premise is that not knowing these things is a gap in transmission, not a defect in the reader — and it never condescends.
Thirty-seven chapters across eight parts are ordered by what hurts soonest. Part I covers money: reading a pay stub and understanding withholding, budgeting, banking and fees, credit, debt and student loans, income tax, saving and investing without getting scammed, and which insurance is worth buying. Part II turns to housing — finding a place, leases and tenant rights, setting up and maintaining a home, cleaning and laundry, and moving without losing your deposit. Part III covers healthcare: using health insurance, navigating doctors and urgent care, fighting a medical bill, and finding mental health care you can afford. Part IV is career — résumés, interviewing, the unwritten rules of a first job, negotiation, and leaving well. Parts V through VIII cover cooking and nutrition, buying and maintaining a car, legal rights, voting and civic participation, important documents, emergency preparedness, digital security and scams, pets, and finally communication, relationships, and building a life you actually like.
The book is organised for the moment you need it rather than for cover-to-cover reading. A Crisis Index at the front routes urgent situations — an eviction notice, a denied claim, a car that will not start, a collector calling — straight to the relevant pages, and most chapters open with a "what to do right now" box. A running project, the Adult Life Operating System, has the reader build one personal reference document a section at a time, so that by the end they hold the file they would want if their wallet were stolen, if they were hospitalised, or if someone else had to take over their affairs for a month. Appendices supply a full resource directory, a glossary, notes for readers outside the United States, and a master checklist; an instructor companion adds a fifteen-week syllabus, in-class activities, and rubrics.