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Content types & schema
Linking content with references
Connect entries to each other — a post to its author, a product to its category.
A reference field links one entry to another, so your content becomes a connected web rather than a pile of separate pages. A blog post points at its author; a product points at its category.
A reference can hold a single link (one author per post) or many (several tags on a post, shown as chips you add and reorder). The link works both ways: from an author you can find all their posts, and from a post you can find its author.
Pick the entry you want from the picker; create the target entry first if it does not exist yet. To reuse a whole group of fields across pages instead of linking to a separate entry, use a stack: What is a stack?.