Configure permalinks

Make permalinks human-friendly for Miguel's bakery site. Change from the default to the Post name structure, rebuild the .htaccess rewrite rules so URLs are SEO-friendly, and test five recent product and blog URLs to confirm no 404s. Tell Miguel if any legacy links need redirects before lunchtime on Friday.

Before I set Post name permalinks for Miguel, make approval straightforward: show the SEO benefit in one line, list any plugins or custom post types that will break, surface three example old-to-new URL mappings, and flag any category or date-based links used in marketing that require redirects.

I switched Miguel's permalinks to Post name and several product pages return 404. I worry I overwrote rewrite rules or a custom post type isn't registered with the new structure. I can't tell whether the plugin or .htaccess is at fault. What's the most likely diagnosis and the fastest safe fix so customers aren't impacted during the morning rush?

Every few weeks we update permalink structure and end up rebuilding redirects for marketing and affiliates. I want a repeatable habit so changing permalinks doesn't cost credibility or sales. Which pre-change checks and a one-paragraph team rule will stop this from recurring?