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.
I’ll add some mouse ones: if you have thumb buttons they are next/previous page.
Mouse wheel down clicking on a link opens it in a new tab.
Mouse wheel down clicking on a tab label closes the tab (no need to hunt for the little x).