The easiest way is to actually install steam - download the steam linux deb, and then right click and install with linux beta - it'll handle all the commands necessary and has a GUI so you don't have to deal with the terminal.
can you like send a video how to do it also how do u install demo on chrome by steam my friend wants to know how
Here's a video of how to install steam on chromebooks with linux beta support:
You can install the demo on steam too - just look for the download demo button on our steam store page.
thx