Using a Chrombook OS

I am totally new here & no nothing about Arduino except what I have learned from Mossimo on Youtube.
I have read the Arduino beginners page & other things on the Arduino web sight but I can't find if I can use my GoogleChrome Book as an OS for Arduino? I also have looked around for info on the subject but I am not really sure what I am looking for. Like I said this is literally my third day after finding out about Arduino but I am totally hooked. I am 77 yrs old but don't let the age throw you I am as sharp as a bowling ball.
I am also a model railroader & that is where I am hoping to eventually put what I learn here to work.

Thanks Alot
choo choo Jerry

Welcome!

There are some options to use Arduino with Chrome OS but unfortunately I don't know of a free one. There is an Arduino Web Editor app, which is $0.99/month:

There is also codebender, which is $10/month but comes with a free 1 month trial:
https://codebender.cc/