Mr.

Hi there,

We have different blog posts explaining the difference between Green Class (1st class) and Ordinary (2nd) class.

Please see:
https://www.jrpass.com/blog/what-to-expect-from-a-green-car-pass

https://www.jrpass.com/blog/first-class-rail-travel-in-japan-is-the-high-price-really-worth-it

https://www.jrpass.com/blog/why-is-1st-class-called-green-class-on-japanese-trains

Hope this helps,
Daniel