Lesson 42: Arrow keys and selecting
Move with the arrow keys and select text with Shift to fix any word.
The arrow keys move the cursor without deleting anything, so a mistake in the middle of a sentence can be fixed without retyping the rest. Home and End jump to the start or end of the line.
Holding Shift while pressing an arrow selects text. Typing then replaces the whole selection, which is the fastest way to swap one word for another.