Apple hides your Library folder because they don't want you accidentally messing it up. When you have to get into it, use the Option key and the Go menu.
How to access your Mac’s Library folder
How to type a checkmark on a Mac
You'll need to type a checkmark someday. Here's how to do it.
Get Mac System Information with a single click
Get detailed information about your Mac in a single move, under the Apple menu. What other people do in two moves you can do in one!