Why do changes apply to all pages when customizing one?

[florian11]

Hi everyone. 

i'm having a basic question regarding page development. 

I created many pages that use the same "default page" template. However when i customize them individually changes apply to all other pages as well and content is being overwritten. Changes are not unique for this specific page. That doesn't really make sense to me. Does every page need its own template? 

This is super basic. Can someone walk me through this easy fix and elaborate how to create unique pages?

Thanks!