Sometimes it is necessary to look for hidden files and folders or to hide a file or folder. Houdini will do it for you. While you could also use the search function in Finder to locate hidden files, Houdini does a better job and shows hidden files the Finder sometimes would not. Freeware.
There’s no magic involved and it’s not a new trick, still many people don’t know this little hint: By double-clicking on the two small, vertical dashes near the bottom of the Finder window (screenshot) you can auto-expand columns to the width needed to display long file- and folder names. That’s it!