(See below to find out how to add or remove items from the Dock.) To the right of this section is a separator, and you see four apps. The leftmost section contains apps that you were in the Dock when you set up your Mac, or that you added. Here’s a screenshot showing each type of content that the Dock can contain. The Dock can also show recently used apps, and you can add files or folders to the rightmost section of the Dock. In standard orientation, at the bottom of the display, the Dock shows apps that you have chosen to add to the Dock, and apps that you are currently using. The Dock has two or three main sections, with lines between them. You can use the Dock in many ways: you can open apps, you can open files by dragging them on icons in the Dock, you can open folders that you’ve stored in the Dock, and more. In the guide below, you will discover the many configuration options you have for the Dock, and the best way to turn the Dock into a high-powered productivity booster. One of the key elements you use to interact with your Mac is the Dock.
Apple + How To Get to Know Your Mac’s Dock