How to access a hidden Library folder on macOS

Solution:

You can access the Library folder with the Go To Folder command or from the Terminal app.

Shortcut

Use the shortcut for revealing hidden folders - CMD+SHFT+DOT (period)

Access the Library folder in Finder:

1. In Finder, choose Go > Go To Folder

2. In the Go To The Folder field, enter ~/library

3. Select Return on the keyboard.

Alternative Method to access the Library folder in Finder:

1. In Finder expand the Go menu
2. Press the Option key
3. Select Library from the Go menu

Access the Library folder directly through the Terminal:

1. Click the Spotlight Search icon in the upper right corner
2. Enter "Terminal"
3. In the Terminal window, enter "open library". The library opens in a Finder window.

To permanently show all hidden files:

1. Open the Applications > Utilities folder, and then double-click Terminal
2. In Terminal, enter the following: 

defaults write com.apple.finder AppleShowAllFiles YES

3. Press return
4. Press Option and right-click the Finder icon in the dock and click Relaunch.
5. To hide files again, use the Terminal command: 

defaults write com.apple.finder AppleShowAllFiles NO

For details about the procedures, see this screencast: