There are (at least) two different conventions when it comes to titling: headline and sentence. It's a matter of taste and something that changes over time. I'm

There are (at least) two different conventions when it comes to titling: headline and sentence. It's a matter of taste and something that changes over time. I'm not sure if there's a reason deeper than that. In general, I think it's good practice for a publication (or site) to have a style manual for consistency, but just as there are separate AP[0] and Chicago[1] style manuals, it's unlikely you'll see one global style. [0]: https://en.wikipedia.org/wiki/AP_Stylebook https://en.wikipedia.org/wiki/AP_Stylebook [1]: https://en.wikipedia.org/wiki/The_Chicago_Manual_of_Style https://en.wikipedia.org/wiki/The_Chicago_Manual_of_Style