Get acquainted with Dark Mode macOS and read detailed instructions on how to change Dark Mode on Mac, how to enable it in apps, and how to manage screen brightness flexibly.
Email signatures are 21st century’s business cards. Not so much in the sense of getting to know people, but rather looking them up later. They are considered good etiquette in any business conversation conducted over email and by now have become the default piece of information to look up when needing to get a hold of someone in your business life.