In this episode, Jonathan Simeone shows us how to add and remove items from the Finder sidebar on macOS.
The Finder sidebar is a list of folders and devices that can be quickly accessed from any Finder window or open and save dialog in macOS. You can choose which categories of items appear in the sidebar by choosing Finder > Settings, (or pressing Command-Comma) clicking the Sidebar button in the toolbar, and selecting the categories you want to include.
To add a specific folder, focus on it in Finder and choose File > Add to sidebar (or press Command-Control-T. To remove a folder, focus on it in the Sidebar and choose "Remove from sidebar" from the context menu, accessed by pressing VO-Shift-M.