One great feature of Vim (and probably other editors) is “keyword completion”: Type the beginning of a word, then press Ctrl-N and Vim will give autocompletion options by scanning all the words in the current file. For example, when I now type “au” and then Ctrl-N, it will suggest “autocompletion”.
This is so very useful when writing text / prose. It’s especially useful for German text with all those long words like “Informationssicherheitsbeauftrager”. I use this feature all time and I sorely miss it when I’m forced to use some other crappy editor. 😩