Create template parts

I need a set of template parts for the blog that keeps authors from rebuilding layout each time. Create header, footer, single-post, and archive templates that match our existing style—use the site font and blue #0d6efd accent—so editors can add content without touching code. Put the header at the top, footer at the bottom, single-post with byline and related posts, archive showing thumbnail, date, excerpt. Test one post preview and report missing assets.

Before I hand this to the content team, make the template parts obvious to non-developers. Surface where to change the logo and the site name, highlight which area editors put the featured image, and call out the place to update social links. Flag anything that will break when site language or widgets change, and suggest a fallback for missing featured images.

I just published a single-post template that looks broken across several posts and authors are calling. I don't know which parts are safe to roll back without losing recent edits or which posts already used the bad template. Tell me the likely cause and the safest next steps to restore the previous template, notify authors, and prevent the bad template from auto-applying.

Across projects we lose time when templates are edited live by editors who think they are editing a single page. Where do we keep failing—permissions, training, or the way templates are exposed—and what habit or rule would stop this? Recommend one policy change and one small UI guard that would cut these mistakes in half.