Ensure your Chunk Title is clear, meaningful and concise.
There are no hard rules on the length of your Chunk Title, it should be as long as it needs to be, but would ideally not exceed about 60 characters (or about 13 words). Consider expanding on the title in the first paragraph of your body content if it helps reduce the length of the title itself.
Each Chunk Title should be unique (avoid titles like “Introduction”, instead make them “Introduction to the specific topic being introduced”).
Try to ‘front-load’ your title with the most important words.