Used to be, your Home folder showed folders labeled Documents, Pictures, Movies, Music, Desktop, Public, and Library. The Library is full of very important stuff that shouldn’t be messed with unless you know what you’re doing, so starting in Mac OS 10.7 (Lion) Apple hid it from us. There are various ways to make it visible, but none as simple as this:
1. Click on the Desktop to switch to the Finder, the open up your Home folder (⌘-Shift-H will do it)
2. Go to the View menu and choose Show View Options (or ⌘-J, as my friend Dave always reminds me)
3. Check the box at the very bottom and “Show Library Folder.” That’s all there is to it. See below.
This only works if you’re looking at the contents of the Home folder (Step 1 above) when you do View/Show View Options. It also only works in Yosemite. If you want to show the Library folder in 10.7, 10.8, or 10.9, on an as-needed basis, try holding the Option key and going to the Go menu. You’ll see “Library” there.