Basic Level:

1. Create an HTML document with the proper document structure.
2. Add metadata to your HTML document, including the document title and character set.
3. Use semantic HTML tags like <header>, <nav>, and <footer> to structure your content.
4. Create a basic HTML page with headings (h1-h6) and sections.
5. Use attributes to add extra information to HTML elements.

Intermediate Level:

1. Write a paragraph of text with various inline elements, such as <strong>, <em>, and <u>.
2. Create a navigation menu with links to different sections of your page.
3. Build a table with multiple rows and columns, including headers.
4. Design a contact form with fields for name, email, and a text area for comments.
5. Insert images and videos into your HTML page.

Advanced Level:

1. Utilize HTML5 features like <audio> and <video> to include media files in your webpage.
2. Develop a template element with slots and shadow DOM.
3. Implement HTML APIs like the Geolocation API or Web Storage API.
4. Ensure your HTML is accessible by appropriately using the tabindex attribute for keyboard navigation.
5. Explore less common inline text elements like <mark>, <code>, and <kbd>.
6. Create an HTML5 <details> and <summary> element to hide and reveal additional content.
7. Use the HTML <dialog> element to create a modal dialog box.