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It can indicate a table or that AutoFilter is on.
There are indeed many online places that offer online classes and/or courses on Microsoft Excel. One such website is sponsored by Microsoft at: www.microsoft.com Microsoft Learning Training.
The fill handle can be turned off in the Excel options, though it is more useful to have it on.
To indicate that the basic file format is XML in Excel 2007 and later.
Microsoft has some excellent free Excel tutors available. See related links for list of Excel subjects available. Recommend you start with the tutor entitled: "Get to know Excel 2007: Create your first workbook"
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Header Row, Banded Row and Calculated Columns make up an Excel Table.
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