Many things can only be known by actually using them.
The production of odoo multilingual website is like this, it is very simple, but you don't know how to achieve it if you don't use it.
First, make a website in one language as the main language
Secondly, after making it, add another language translation, first switch to the language you want to translate, click on the page you want to translate, click the "Translate" button in the upper right corner, the "Translate" button is the language you switch to, page becomes
Yellow or green, you can paste the translated language into it.
It's that simple, the odoo website translation operation link:
https://www.odoo.com/documentation/user/10.0/website/publish/translate.html