This extension will help you to guide how to install snipping tool for chromebook
Snipping tool for chromebook is here. free to download on chrome os.
follow this below guide to use Snipping Tool on Chromebook.
To open the Snipping Tool, press the Start key, type snipping tool, and then press Enter. (There's no keyboard shortcut to open Snipping Tool.)
To choose the type of snip you want, press Alt + M keys and then use the arrow keys to choose Free-form, Rectangular, Window, or Full-screen Snip, and then press Enter. (Alt + M is available only with the latest update to Windows 10). When making a rectangular snip, hold down Shift and use the arrow keys to select the area you want to snip.
To take a new screenshot using the same mode you used last, press Alt + N keys.
To save your snip, press Ctrl + S keys. To copy it to the clipboard, press Ctrl + C keys.