There is no File tab in the Mac Office 2016 programs, nor will Alt+F [or any other keystroke] access the Ribbon. There are numerous differences between the Mac version & that provided for Windows. It may be worth the time to use Help> Excel Help to review the Tutorials & Videos. Comparable support is available from the Help menu for the other Office 2016 programs.
If you still have any specific questions, don't hesitate to post a new message detailing the concern.