Schema markup is code you add to your pages that describes your content in a format search engines can parse. Instead of guessing whether "Apple" means the fruit or the company, schema explicitly labels entities, prices, reviews, events, and hundreds of other types. Google uses this to generate rich results like star ratings, FAQ accordions, breadcrumbs, and product cards in search. The easiest implementation method is JSON-LD script blocks in your page head or body. Go to schema.org, find the relevant type (Article, LocalBusiness, Product, Event, etc.), copy the structure, fill in your data, and paste it between <script type="application/ld+json"> tags. JSON-LD sits separate from visible HTML, so it won't break your design if you make a mistake. Google Tag Manager works well for injecting schema without touching code, especially for e-commerce tracking or dynamic pages. For WordPress or Shopify, plugins like Yoast, Rank Math, or Schema Pro auto-generate basic markup, but they often produce bloated or incomplete output. We always hand-code schema for clients in the 500+ domain portfolio because plugins miss nuanced properties like aggregateRating, offers arrays, or properly nested Organization and WebSite schemas. A LocalBusiness schema for an Ottawa contractor, for example, should include areaServed with geo coordinates, priceRange, and a sameAs array linking to GMB and social profiles. After adding schema, validate it with Google's Rich Results Test and the general Schema Markup Validator. The Rich Results Test shows which features you qualify for; the validator catches syntax errors or missing required fields. Common mistakes: forgetting to close JSON objects, using http instead of https in URLs, omitting required properties like "name" or "image", and nesting types incorrectly. Start with Organization and WebSite schema on your homepage, then add Article schema to blog posts, Product schema to e-commerce pages, and LocalBusiness if you serve a geographic area. Breadcrumb and FAQ schema are low-effort wins that often trigger rich results within days. Schema doesn't directly boost rankings, but it increases click-through rate by making your listings more visible and trustworthy, which indirectly signals relevance over time.