MS Excel
You can select a single range of cells by

Pressing the Shift key and an arrow key
Pressing the Ctrl key while dragging over the desired cells
Dragging over the desired cells
Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells

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MS Excel
Right clicking something in Excel:

Nothing the right mouse button is there for left handed people
Deletes the object
Opens a shortcut menu listing everything you can do to the object
Selects the object

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