h moves the cursor left. j moves the cursor down.
Vi How To Navigation Tips
While the arrow keys work, relying on them slows you down and creates bad habits. This places the editor in insert mode, and you will see the text "INSERT" appear at the bottom of the screen.
k moves the cursor up. To return to Command Mode, press the Esc key.
Vi How To Navigation Tips: Essential Cursor Movement Keys
If you make a mistake and then perform other actions, the U key (shift + u) will revert all changes made on the current line. This is the most critical transition to memorize.
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