If something is wrong with your Mac, either you or the tech repairing your Mac will need to access the special diagnostics mode. You can do this by restarting your Mac and holding the D key. The results could give you some insight into the problem. See https://support.apple.com/en-us/HT202731 for details.
You can use the Image Capture app to scan documents and pictures instead of any software that may have come with your scanner. This can extend the life of scanners with incompatible software and may give you more features.
It can be confusing to try to understand the difference between USB-A, USB-C and other port types and to differentiate that from USB-2, USB-3 and other USB versions. In this video Gary attempts to explain the demystify these terms. Also, learn how USB-C connectors on newer MacBooks are also Thunderbolt 3 ports.
It can be useful for new Mac users, those switching from Windows, or even experience Mac users to take a tour of the typical Mac keyboard. Learn what modifier keys are called and what they do. Find out about keys that may not always be called the same thing that is printed on them. Learn what some obscure keys are used for.
If you want to upgrade the memory in your older Mac, you can find the information you need on the Apple website. Apple maintains specific pages for different types of Macs. You can find out what type of memory you need to buy and how to install it.
Most off-the-shelf USB flash drives are formatted for Windows computers. You can easily reformat a drive to use the standard Mac OS Extended format with the Disk Utility app. Keeping the drive in MS-DOS format may be a better option, however, if you plan to use it on both Mac and Windows computers.
Take a look at the Touch Bar on the new Macbook Pro. This thin touchscreen that replaces the function keys on the keyboard allows you to easily access functions for macOS and apps. It changes depending on which app you are using and what you are doing.
The new ports on the MacBook Pros are billed as Thunderbolt 3, but it is better to think of them as USB-C. They can handle USB, Thunderbolt, video and power. They are a single port to handle just about any peripheral need. If you have old devices and cables, then converters are cheap and easy to find.
If you don't use the Caps Lock key, you can disable it to prevent accidental use. You can also re-assign it as an optional Command, Control, Option or Esc key.
I often hear myths and misconceptions about Macs in the comments and questions I get at MacMost. Here are some of the most common ones I see.
In this MacWorld Expo special, take a look at the latest developments from Axiotron, the developers of the Modbook. A new version now has some touch as well as pen capability, and a new model will soon support MacBook Pros.
Eve Park takes a look at the Modbook from Axiotron, a tablet Mac made from a MacBook with a pressure-sensitive tablet screen.