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’m still on Windows, because I’m a lesser human, etc…
That said, PowerToys adds a lot of nice features to Windows (more like…Sindows, amirite), like being able to break your screen into zones, etc…
My biggest computer life hack of all time would probably be: piracy. Highly recommended. Saves you so much money, I’m surprised they don’t advertise it more.