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Alt+Page Down, Alt+Page Up: Move left and right one screen in Excel
To move to the right in Excel to see your next group of columns, you could scroll. Or you could press the Right Arrow key a bunch of times.
Or, press Alt+Page Up. You immediately find yourself one screen to the right looking at your next batch of columns.
Conversely, Alt+Page Down moves you to the left.
(Compare to the regular Page Up and Page Down, which you already know moves you up and down a screen.)