Letters refer to columns.
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They are called cell content. They could be labels or formulas.
Assuming you want the percentage of the total, and that the numbers are organized in a column: you first calculate the total at the bottom of a column of numbers. Then, in the next column, you put a formula that divides the number by the total. (It helps to press F4 for the total - that way, its cell reference won't change when you copy the formula down.) Then you select the range and give it a percentage format. This will automatically multiply it by 100 for display purposes; for this reason, I didn't include the "*100" in the formula.
Yes. Formulas can contain all sorts of things, including absolute and relative cell references.
A cell in a matrix (or 2-dimensional array).
The relative addresses will change as the formula is copied.