I am a start-programmer and new to magento 2.
I can't find the 'Home Page' location in the tree of all files...
The home page goes fine on the url-web but I can't find his path in the tree...
I want to change it through the 'view-html-page' and not through admin page
You won't find the home page file.
Home page is a CMS and all CMS are managed by the CMS module.
The content is stored into database and you can edit or create that content from your backend.