Please share your hidden macOS features or tips and tricks
In any Finder window or Open/Save dialog, you can hit ⌘&#x21E7;G (just '/' also works in Open/Save) to get a location bar from which you can directly type in the directory to go to. It even supports ~ for home and tab completion.

The Open/Save dialog has several other useful shortcuts:


⌘  R -
Reveals the selected item in a new
Finder window.
⌘  I - Info window shows for the selected item.
⌘  &#x21E7;  > - Shows/Hides hidden files in the dialog
⌘  F - cursor jumps to the Find text field
/ or ~ - Opens a Go To Folder dialogue. 
⌘  D or ⌘  &#x21E7; D - selects the ~/Desktop folder as a destination
⌘  &#x2325;  L - selects ~/Downloads folder as a destination
⌘  &#x21E7; O - selects ~/Documents folder as a destination
⌘  &#x2325;  S - Shows/Hides sidebar
⌘  . or esc - Cancels and closes the dialog window