[OSX] Display hidden elements in Finder or dialog

I have always problem with it. How to show hidden files or folders in file selector on Mac? Nearly every resource on Google tell us:

enter “defaults write com.apple.Finder AppleShowAllFiles YES” in terminal and restart Finder

Blah.

If you have opened “Select file” dialog, press:

Cmd + Shift + . (period)

This will reveal hidden elements in dialog. Press it again to hide. Easy and simple.