Resource library
Reference

Resource library

Every free source this manual relies on, grouped by subject, with who publishes it and the date we checked it.

We fetched every page below on 2026-10-19 and read it before citing it. We check every link again once a year; the next check is due 2027-10-19. Agencies and makers change their pages, so a page here may have moved or changed since. No link carries a referral or tracking code, and we receive nothing from any of these organizations. The key in brackets after each entry is how the chapters and tables refer to it.

Limits

A page listed here is a source we relied on for a specific fact, not an endorsement of the organization or of anything it sells. Where a company's own help page describes its product, the description is the company's.

Courses and curricula we compared

Listed as references only. Prices are not shown; several are paid. We are not affiliated with any of them.

Accounts, passwords, two-step sign-in and passkeys

Account recovery, legacy access and backups

Devices, updates and home Wi-Fi

Scams, identity protection and what to do when something goes wrong

Checking what you read online

Writing and design for readers new to technology

Used for how this manual is written and laid out.

Added at the build (2026-10-19)

Pages fetched to fill gaps the outline listed: device paths, spam filtering, Samsung, AOL, trusted contacts and the domestic violence hotline.