Save info without being Post related

Hello, new in Ghost!

I want to create and manage if possible in back office some post not related info!
Like have car brands and car model’s(for exemple )! That is related to each other!
And want to send it to front end to be display in the index page!

Is this user case supported by ghost? If so where can i find a exemple or documentation!

Read the documentation and search here and don’t found the answer!

Thanks in advance