There have been many site-builder tools for building flexible layouts in Drupal including Field Collection, Panels, and Paragraphs. But only one of them is part of Drupal core: Layout Builder. Layout Builder provides a clean and user friendly drag-and-drop editorial experience. But don’t take my word for it. If you haven’t read the amazing blog post, The Big, Bad Layout Builder Explainer by Caroline Casals you owe it to yourself to do so. Go ahead, I’ll wait.