There are two methods to get tha hidden files visible.
1. The keyboard shortcut:
Go to a location where you would like to see any hidden folders.
Click this key combination: COMMAND-SHIFT-.(period)
This will show all hidden folder, if you press the key combination again, the visible now folders will be back hidden.
2. Terminal method
In Terminal enter the following code:
defaults write com.apple.finder AppleShowAllFiles true; killall Finder
This will show all hidden folders in the system. If you want to revers back to hidden folders, just change the 'true' to 'false'