Learning Mac Computers - Navigating the Mac
http://edu-observatory.org/olli/Mac_Computers/Week1.html   or   index.html

macOS High Sierra

Apple Recruitment Video

Excellent Reasons of Buy/Own/Use a Mac
  o Highest quality Materials, Hardware and Software
  o Updates are free and often thrilling
  o Security & Privacy

Mac security facts and fallacies

  Mac threats have had exponential growth since 2010, when
  adware and Potentially Unwanted Programs (PUPs) weren't
  really a thing on the Mac yet and when new malware sightings
  were few and far between. We're seeing large numbers of
  people infected with Mac threats every day, on a much larger
  scale than even just a few years ago.

  Clearly, there is an epidemic problem with threats--mostly
  adware and PUPs--on the Mac, and also clearly, the built-in
  security in macOS is not adequate to deal with this problem.
  It is becoming increasingly necessary for Mac users to have
  an additional layer of security, and in particular, to have
  something that is effective against adware and PUPs. If
  you're a Mac user, you might consider downloading software
  such as Malwarebytes Anti-Malware for Mac, which removes
  adware, PUPs, and malware for free.

Kreb's 3 Basic Rules for Online Safety:
  1. If you didn't go looking for it, don't install it!
  2. If you installed it, update it.
  3. If you no longer need it, remove it.

Home Computer Security (for all computers and all users)

Mac Support


  The Mac Desktop, like a furniture desktop, may be kept clean
  ready for some new project, or like some, piled with things
  (icons), such that one has to sort through to find this or
  that. There are several good reasons not to clutter your
  Desktop unnecessarily. One is that every icon is a running
  process that does take some Processor time.

Upper Left (changes with each app)

The Apple Menu - Upper Left Corner

About This Mac

Apple Manuals (Use the Mac Serial Number)

Check Your Service and Support Coverage (Use the Mac Serial Number)

System Preferences

Upper Right

WiFi Control

Dock (a place for apps you use a lot)

Finder (your file system)