HTML offers six levels of headings, from <h1> (the highest level) to <h6> (the lowest level).

1. <h1> – Main Heading (Largest):

• Represents the primary topic of the page.
• Use it sparingly to maintain clarity.

2. <h2> – Subheadings:

• Ideal for dividing content into sections.
• If further subsections exist, employ <h3> elements.

3. <h3> to <h6> – Smaller Headings:

• Gradually decrease in size.
• Use them for finer subdivisions.

Remember that HTML headings should be used based on the logical structure of the content, not just for styling purposes. This ensures that both humans and machines can better understand and navigate your web pages.