When you launch Photoshop, the Tools panel is located on the left side of your screen. Each tool has a separate function. More tools are hidden in the Tools panel; they are called Nested tools. A tiny arrow in the lower-right corner of a tool indicates there are more tools underneath. Every Photoshop tool (with the exception of Zoom) has nested tools. Right-click or click and hold for two seconds on a tool, and the nested tool(s) will pop up. The letter shown next to the tool’s name is the keyboard shortcut for selecting that tool.