When designing any page, including those without a specific template (for example, if you want to make a page on a newspaper company), subdivisions are still necessary. If you want to add a new infobox make sure it isn't taken yet.
These are always necessary and should be bolded or italicize to make them more apparently different.
These are for more specific details on a general subheading 1. For example SH 1 can be titled "early history" in a history article, and SH 2 can be events. These arent required unless otherwise stated to be. Going lower on subdivisions isn't recommended due to the fact that they become tiny and hard to read.