It may sound strange to put henna (otherwise known as a green powder that smells like freshly cut grass) on your hair for several minutes, let alone a few hours, but there’s a method to this madness.

The days of 10-minute long YouTube tutorials are over – you can now learn how to recreate a hairstyle in under 60 seconds. The hashtag #hairtutorials on the app has over 6.3 billion views and ...