Finder add "Applications"

Try Mac Basics: Modify your windows

...You can also modify your Finder window's sidebar preferences.

1. From the Finder menu, choose Preferences to open Finder preferences.
2. Click Sidebar to display its preferences.
3. Select the checkbox next to the items that you want to see displayed in your sidebar Favorites, Shared, and Devices lists.

A. Drag the Applications folder into the Dock.

B. Create a new Applications folder in your Home folder.

C. Create an alias in your Home folder to the real Applications folder.

D. Drag the /Home/Applications folder into the sidebar.

Take your pick.

To place an application into the sidebar just drag its icon into the sidebar.