Here are 10 hidden / secret tips for macOS Catalina (10.15) for MacBook, iMac, Mac:
1. Enable automatic dark mode based on the time of day
2 – Use an iPad as a second screen
3 – Find your lost devices with Find My
4 – Watch any video in Picture in Picture
5 – Use Screen Time
6 – Sign a document using your iPhone or iPad
7 – Back up your iPhone to Finder without iTunes
8 – Unsubscribe from newsletters and mute conversations.
9 – Authorize passwords on your Mac with your Apple Watch
10 – Manage window display
