Moving the insertion point with the arrow keys

Praise be to the Apple Developer Connection's zen-master revelations: "The keyboard's primary use is to enter text."
Indeed! But here's another one of those "How could I have lived before this?" set of non-obvious productivity tips: use can also

use the keyboard to navigate your text documents
:

Key

Moves insertion point

Right Arrow

One character to the right

Left Arrow

One character to the left

Up Arrow

To the line above, to the nearest character boundary at the same horizontal location

Down Arrow

To the line below, to the nearest character boundary at the same horizontal location

Option–Right Arrow

To the end of current word, then to the end of the next word

Option–Left Arrow

To the beginning of the current word, then to the beginning of the previous word

Option–Up Arrow

To the beginning of the current paragraph, then to the beginning of the previous paragraph

Option–Down Arrow

To the end of the current paragraph, then to the end of the next paragraph (not to the blank line after the
paragraph, if there is one)

Command–Right Arrow

To the next semantic unit, typically the end of the current line, then the end of the next line

Command–Left Arrow

To the previous semantic unit, typically the beginning of the current line, then the previous unit

Command–Up Arrow

Upward in the next semantic unit, typically the beginning of the document

Command–Down Arrow

Downward in the next semantic unit, typically the end of the document

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