There are some hidden folders by default in Mac that may eat some of your space in hard drive and sometimes they becomes hidden due to some applications.
If you want to view every hidden folder of file, in you Apple macbook i.e. Mac OS X then follow these steps -
Go to your applications folder > then to utilities
Here you would find the terminal application, open it.
It’s just like the cmd run in windows and the function you enter in it is acted upon by the Mac OS.
Then enter these 2 phrases one after the other, by separating with usage of return key in middle.
defaults write com.apple.finder AppleShowAllFiles TRUE
This would make it look like this -
This will make every hidden file in your mac hard drive visible and you can have a check on that.
And again if you want to switch back to the normal version, where the hidden files are hidden and not viewable, then enter these 2 lines one after the other -
defaults write com.apple.finder AppleShowAllFiles FALSE
It would look like -
Remember that it is a safe way as the folders would not at all be effected when you are viewing them or hiding them back.