A list of articles to help you solve problems on Macs running Sierra, High Sierra, and Mojave (10.12-10.14). For older articles about previous versions of OS X, see this article.

Breaking

Booting the Mac

Setting up a new or repurposed Mac

Preparing to part with your Mac

Signposts

Essentials – also see Downloads item above for free apps available here

Mojave, macOS 10.14

Startup modes

Finding information and tools

Security

Online

General

High Sierra – macOS 10.13

iCloud

Permissions and Extended Attributes

Versioning and revisions

Scheduled Events

Installers

Apple’s New File System, APFS

Time Machine

Keychains

Help Services

Console, Consolation, log, and reading logs

Swift 3 snippets and tips

Scripting macOS using Swift

Sierra, macOS 10.12

Advanced troubleshooting tools

Building a cheap, large, fast external SSD

More troubleshooting

Storage

Inside OS X / macOS

Network and internet issues

Data and its protection

Accessibility

Colour Management for the Non-Professional

Data formats and conversion

Hardware upgrade and disposal

Hypertext – Storyspace and Tinderbox

SDR (Software-defined radio)

Polyglot programmer – lots of lesser-known languages

Words on Macs – text processing and problems on Macs

Other security news

External links