If the keyboard shortcut isn't working for you, or if you want to force the system to always show hidden files across every reboot, you can use the . Open Terminal (found in Applications > Utilities).
If you want Finder to always show hidden files even after a restart, use the app found in Applications > Utilities . show hidden finder link
Go to (or Preferences on older macOS versions). Click the Sidebar tab. If the keyboard shortcut isn't working for you,
Common scenarios:
Now you have the complete toolkit: