You can select a command by clicking its icon in the Image context tab. Positioning the pointer over a command will display a tool tip with the command’s name. There are selecting commands and painting commands.
The Selecting tools
The Selecting tools include the Rectangular Marquee command, the Magic Wand command, the lasso commands (the Lasso command and the Polygonal Lasso command), etc. To see how to use these commands, please follow the steps as below.
The Rectangular Marquee command: