Dragging Favorites to sidebar will transform it.

This is neither a killer tips nor an amazing tricks. This is just my curious that Mac transform Favorites to heart-shaped icon. It's just.. strange.

You can also try. Here are the steps:

1. Find the folder named Favorites. Its location is Home → Library
2. Highlight the Favorites folder
3. Move it to sidebar with. Either Drag&Drop or keystrokes Command-T can be used
4. You can see that it's transformed into heart