How to Make the Library Visible Permanently
Apple hides the Library folder by setting a file system flag associated with the folder. You can toggle the visibility flag for any folder on your Mac. Apple chose to set the Library folder’s visibility flag to the off state by default. Here’s how to change it.
Unhide the Library Folder From the Go Menu
You can access the hidden Library folder without using Terminal. However, this method makes the Library folder visible only for as long as you keep the Finder window for the Library folder open.
Access the Library the Easy Way (OS X Mavericks and later)
If you use OS X Mavericks or later, you have the easiest way of all to permanently access the hidden Library folder. This method is recommended for anyone who wants permanent access and isn’t worried about accidentally modifying or deleting a file from the Library folder. The Library folder contains many of the resources that installed applications need to use, including preferences, support documents, plug-in folders, and the files that describe the saved state of applications. It has long been a go-to location for troubleshooting issues with individual applications or components shared by multiple applications.