head.hbs partial
This partial is used as a beginning of your theme's *.hbs files in every file which will display the head of your website:
{{> head}}
With this solution you won't need to duplicate code nor apply changes across multiple files.
Helpers meant for the <head> section, such as publiiHead, metaDescription, metaRobots, canonicalLink, socialMetaTags, jsonLD and feedLink, usually go in this partial.