If you need to quickly share screen with your friend or colleague or get help from somebody, it's very easy to do it on Chromebook.
1) go to https://remotedesktop.google.com/support/ and click on a + button at the end of url address bar (near the add to bookmark star button)
or just click install if you have a small pop up at the bottom right of the screen
2) then click on the download button to get extension and install it
You can now share by searching for Chrome Remote Desktop in the launcher menu or just going to that link above. And so you're ready to share your screen or see another person's screen to give them support.
To share your screen, just generate the code and share it with your friend:
Hi, here's my screen. Please enter the code below in the Give Support section
https://remotedesktop.google.com/support/
Code is: (digits)
To give support to someone and see their screen, just ask them to go to that link and install the extension and share the code with you.
P.S.: you can also control their mouse / touchpad and keyboard.