Mine is using the arrow keys to navigate typed text while writing and editing. It helps speed things up, versus having to move your hand to the mouse to navigate.
Use the Up and Down Arrows to move/jump vertically.
Left and Right Arrows to move/jump horizontally.
Combine Left or Right Arrow with Shift to be able to select text. Use Up or Down Arrow with Shift to quickly select whole/nearly whole sections of text.
Combine Control with Left/Right Arrow to jump whole words to more quickly move to where you want to type.
Combine home and end with ctrl to move to the start or end of the file. As a dev I use this a lot.
I also have keyboard shortcuts for code folding and mouse shortcuts to navigate between usages, declarations and implementations. Onboarding people is a slog when they don’t have the same shortcuts.