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Shane Cutts15,107 Points
Why does the template file name need to be broken up? ie. ( 'content', 'none' );
When using a PHP function like "get_template_part", why does the template file name need to be broken up? ie. ( 'content', 'none' );
Jeremy Castanza12,081 Points
Those are parameters for the get_template_part function. The first one is required (slug) and the second is an optional (name) parameter. It basically has to do with how customized your code is and I believe it's also related to child theme development.
The whole idea with the get_template_part function goes back to a concept in programming called "DRY" - "Don't Repeat Yourself." The idea behind this aspect of Wordpress is that your code is only written one time in one place, which makes updates to code a lot easier to manage. It also keep your code trim, which improves performance.
I recommend referencing the Codex too for some other helpful info. https://codex.wordpress.org/Function_Reference/get_template_part