Control + Arrows also moves your text cursor by whole words. Combine it with shift and you can easily select a bunch of text without the mouse.

Another one that took me far too long to learn: Shift + Tab will do the same thing as tab (next element) in reverse

similarly if you're using arrow keys to move the cursor where you want, ctrl + arrow key moves you along word by word instead of letter by letter.

In bash, it's alt-backspace 👍

Ctrl + shift + v to strip formatting before pasting (can be application dependent)

For a key-combo I've found handy:

shift + ins = a more general paste-command. While ctrl + v works in most Microsoft-contexts, shift + ins seems to work both in MS Windows, Command prompt, Linux and several other systems.