1. The head element contains the metadata for the document. In HTML, metadata provides the browser with information about the content and markup in the document, but also include scripts and references to external resources.
2. The body element encapsulates the content of an HTML document, as opposed to the head element, which encapsulates metadata and document information.
3. The metadata elements let you provide information about the HTML document. They are not content themselves, but they provide information about the content that follows. Metadata elements are added to the head element.
4. The style element lets you define CSS styles inline in your HTML document.