How to use Mac arrow key shortcuts like a pro

We've got some handy shortcuts that help you out when you're working on documents on the MacBook family of computers or using any smaller Mac keyboard that lacks the numeric keypad.

Question

I have a problem with the way the Up and Down arrow keys work on my MacBook Air: Whenever I hold down Command + Up/Down arrows, the page jumps to either the very top of the document or the very bottom. Is there a way to change this so that the Up/Down arrow keys move the document in single-page...

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