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Purple Triangle :)
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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.
To indicate that the basic file format is XML in Excel 2007 and later.
The fill handle can be turned off in the Excel options, though it is more useful to have it on.
A dotted line.
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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"
Header Row, Banded Row and Calculated Columns make up an Excel Table.
Excel assumes data is text initially, but can treat it differently depending on the way you enter it. That is why you enter an equals sign at the beginning of a formula to indicate to Excel that you are creating a formula.