Layout is made of container blocks, such as main, sidebar, header, footer. Container blocks contain other container blocks or content blocks, but never both at

Layout is made of container blocks, such as main, sidebar, header, footer. Container blocks contain other container blocks or content blocks, but never both at the same time. Content blocks are paragraph-like content and may contain blocks (headings, media) and inline content (leading and body text, captions). Example hierarchy: layout > main content area > hero element > positioned container > content block > heading