How does this Mac OS X 10.9 Mavericks tutorial work?

Who should read this free online Mac OS X Tutorial?
- you want to know how a Mac works
- you are a Mac user with a problem or a question

This website tells you all about Mac OS 10.10 Yosemite and 10.9 Mavericks.
Not sure which system version your Mac has? Scroll down for an explanation. How does this tutorial work?
The tabs above show the main chapters. These chapters are extended - if needed - with a link on the bottom of the chapter.

This tutorial is also color coded:
text in a purple section = SWITCH-TIP (especially for Switchers: users who choose to switch from MS Windows to Mac OS X)
text in a yellow section= TIP (for more experienced users, absolute beginners should skip these at first)
text in a black section = WARNING (important to all Mac users)

grtz, MacMiep
What operating system is my Mac using?
Watch this movie and find out:

Note: This website handles Mac OS 10.9 Mavericks and Mac OS 10.10 Yosemite.
Users of Lion and Mountain Lion might find this website useful too. The images still look quite familiar.
However, regarding security issues: please upgrade your Mac to the latest operating system possible.

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Disclaimer: MacMiep is independent. This means she writes what she wants, based on 20+ years of Mac-experience. She doesn't get paid for stories (positive or negative) on this website.