I had no idea that existed and it is a game-changer. Thank you!

This is one of the best things I've learned this month! Thank you

This is really great, thank you. I wish Apple’s weird “intuitive” gestures were more discoverable, on both macOS and iOS. They are often good, but they lack the visual hinting that you get from keyboard shortcuts.

That's not the full story. From iOS 12 you can do the long touch on the spacebar and get the same functionality as the 3d touch on the rest of the keyboard.

Great for me as 3d touch is so flaky on my iPhone since I got the screen replaced.