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.
Keyboard shortcuts in general.
Alt + left right (previous/next page in browsers)
Windows + 1 (2, 3, …) on Windows and KDE focuses the window at that position in the taskbar
Alt + Tab to switch windows (hold shift to go backwards)
Windows + Tab to switch windows within the same application (like, all browser windows if you’re in a browser)
Alt + 1 (2, 3, …) on Windows/Linux usually selects the corresponding tab
Ctrl + Tab to cycle through tabs like Alt-Tab does for windows (hold shift to go backwards)
In most browsers or things with a URL/go to bar, Ctrl+L will focus that. No need to click the address bar, Ctrl+L, example.com, Enter.
In Discord and Slack, you can press Ctrl+K to open a box to quickly type a channel/DM name to go to it quickly
If you have them, the Home/End/PageUp/PageDown keys are actually pretty useful. Press Home instead of scrolling all the way back up.
F1 is usually help
F2 is usually rename
F3 is usually search
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).
F6 - goto and highlight the URL bar in a browser
ctrl + F5 - clear cache and reload the tab
F11 - super full screen browser