# Common Beginner Mistakes — HTML Fundamentals: Structure, Forms and Accessibility Source: https://www.skillbyai.com/en/html/html-common-mistakes > Avoid common beginner mistakes such as unclosed tags, div overuse and invalid element nesting. ## Unclosed tags & div soup Forgetting a closing tag can silently break layout. Wrapping everything in `
` instead of semantic tags loses meaning for no visual gain. ## Invalid nesting A block element like `
` cannot legally sit inside an inline element like `` or `` in some contexts — check the spec if a layout looks broken for no reason. **Quiz:** Which is a common beginner HTML mistake? - [ ] Using semantic tags like