Habits that keep HTML valid, maintainable, accessible and ready for production.
Good HTML starts with correctness: always include the doctype, set the lang attribute on the html element and declare UTF-8 encoding, use lowercase tags and attributes consistently, close elements properly, and keep ids unique. Choose semantic elements over generic divs, keep a logical heading order, give every image meaningful alt text, and associate every form control with a label. Validate your markup with the W3C validator to catch errors that browsers quietly paper over.
Maintainability matters as much as correctness. Keep structure, style and behavior separate by avoiding inline styles and event handler attributes, use clear and consistent class naming, and don't nest elements deeper than necessary. Include the responsive viewport meta tag, load scripts with defer, and consider performance, accessibility and security from the beginning instead of treating them as afterthoughts. Interviewers use this topic to see whether you can combine everything you've learned into a consistent professional approach.
What you'll walk away knowing