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
Essential Mac Keyboard Shortcuts: Command-1, -2, -3, and -4
Switch between the Finder's icon and list views with simple keyboard shortcuts. What could be easier than Command-1 and Command-2?
How to take a picture of the screen (screenshot) on a Mac
Command-Shift-3 takes a picture of the entire screen. Command-Shift-4 takes a picture of whatever you draw a box around. There are other options too!
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!