If you don't plan on installing macOS High Sierra for whatever reason, your Mac will still inform you of the software update every now and then via persisting system notifications.
How to stop “Upgrade to macOS High Sierra” notifications
Guide
How to use Siri News on iPhone & iPad
If your iPhone, iPad or iPod touch runs iOS 11.2.5 or later, Siri in hands-free mode can read out the news to you. You can even ask your smart digital assistant to read aloud news stories limited to specific domains, such as sports, business or music, here's how.
How to copy an SMS, MMS or iMessage on your iPhone and iPad
Learn how to copy SMS texts, MMS messages or iMessages from Apple's Messages app on iPhone and paste the whole message or some text into another app.
How to prevent Instagram from broadcasting your online status to friends
Facebook-owned Instagram is pilfering a feature from Messenger and WhatsApp that makes stalking people a lot easier. It's enabled by default, but can thankfully be turned off at will.
How to convert HEIF images into JPEG format with Preview for Mac
iOS 11 and macOS High Sierra debuted HEIF, Apple's new efficient image format meant to supplant JPEG by delivering the same or better quality at half the file size. That's great, but what about converting your HEIF photos into the more compatible JPEG format?
How to adjust your Mac’s startup security level with Secure Boot features
Learn how to manage your T2 Mac's Secure Boot settings to ensure your computer always starts from a legitimate and trusted operating system.
How to send live videos in Instagram Direct
Instagram for iPhone version 26.0 brought out a new, very useful capability for those times when you'd like to send your own or someone else's live video broadcast to a friend or a group of friends through the app's built-in messaging service, called Direct.
A quicker way to toggle hidden files on macOS, no Terminal required
Sometimes you need to edit a system file, or look at a file created by one of your programs. Many of these files are hidden by default, so you'll need to make them visible before you can go about your business. One example I often encounter is hosts files, either for SSH or for your computer's whitelisted and blacklisted domains, though there are many others.
How to restore a bricked iMac Pro
If your iMac Pro is refusing to boot following a power failure during a macOS software update or has stopped functioning properly, which may happen in certain circumstances, you might need to perform a DFU-like restore process using a secondary Mac and Apple Configurator.
How to block iOS firmware updates, prompts, and background downloads
A big problem potential jailbreakers face is that of updating too far to be supported by eventual tools. Either through impatience, or by accident, I hear often that a user's device is now on too high a firmware to enjoy the latest release.
How to check if the battery in your iPhone needs to be replaced
Once its cycle count has reached 500 complete charge cycles, your iPhone's battery is considered consumed as its ability to provide power reduces. As a result, you may need to charge the phone more and more frequently and it might exhibit unexpected shutdowns.
How to block automatic updates and prompts on non-jailbroken Apple TV 4 and 4K
With the release of Ian Beer's new exploit, some hope for a future Apple TV 4/4K jailbreak has appeared. The exploit will theoretically work on firmwares up to and including tvOS 11.1, but not 11.2 and higher. For this reason, I advised in my jailbreak guide that Apple TV 4/4K users who want to have a chance of jailbreaking manually restore now to tvOS 11.1, before it goes unsigned. You can use our guide on the topic to do so.