Choose a schema type, fill in the relevant fields (add multiple rows for FAQ questions or breadcrumb items), then click Generate. Copy the <script type="application/ld+json"> block and paste it into the <head> of your page.
JSON-LD is the format Google recommends for structured data. It describes your page's content (an article, product, FAQ, business, etc.) so search engines can show rich results like star ratings, FAQ dropdowns and breadcrumbs.
Article, Product (with offers/price), FAQPage, LocalBusiness (with postal address), Organization and BreadcrumbList. Each type shows only the fields relevant to it.
Paste the entire <script type="application/ld+json"> block into the <head> of your HTML page. You can validate it afterward with Google's Rich Results Test or the Schema Markup Validator.