Mobile-first indexing has been the default for all sites since 2023 — Google primarily crawls and indexes the mobile version of your site. For Canadian businesses, this means the mobile experience is no longer secondary to desktop; it is primary. Sites that still treat mobile as a stripped-down afterthought are systematically suppressed in rankings. The practical preparation steps for sites that may not be fully mobile-first ready: **Content parity.** Mobile and desktop versions should contain identical content. Common parity failures: hiding content on mobile via CSS to fit smaller screens (Google sees this as content the user doesn't get); loading additional content on desktop that doesn't load on mobile; using accordions or tabs on mobile that don't load content until interaction (Google may not see the hidden content). **Structured data parity.** All structured data on the desktop version must also exist on the mobile version. Schema.org markup is one of the most commonly missing elements on responsive sites that have separate mobile templates. **Meta tag parity.** Title tags, meta descriptions, hreflang annotations, robots directives, and canonical tags must match between mobile and desktop versions. **Image accessibility.** All images must have alt text on mobile (often missing when mobile templates strip down image usage). Image lazy loading must use modern loading="lazy" attribute or Intersection Observer rather than older techniques that hide images from crawlers. **Mobile page speed.** Largest Contentful Paint, First Input Delay (now replaced by INP), and Cumulative Layout Shift are measured on mobile. Aim for LCP under 2.5 seconds, INP under 200ms, CLS under 0.1. **Mobile UX.** Tap targets at least 48px square, font sizes at least 16px for body text, no horizontal scrolling, no intrusive interstitials. Validate mobile rendering through Google Search Console's URL Inspection tool — it shows you exactly what Googlebot sees on mobile, which is occasionally different from what you see in browser developer tools.