Headings and subheadings organize content for readers and should be very descriptive.
Headings (H1) give people a taste of what they’re about to read. Use them for page and blog titles.
Subheadings (H2, H3, etc.) break articles into smaller, more specific sections. They give readers avenues into your content and make it more scannable.
Headings and subheadings should be organized in a hierarchy, with heading first, followed by subheadings in order. (An H2 will nestle under H1, an H3 under H2, and on down.)
Include the most relevant keywords in your headings and subheadings, and make sure you cover the main point of the content.
Use title case, unless the heading is a punctuated sentence. If the heading is a punctuated sentence, use sentence case. Use sentence case for subheadings regardless of end punctuation.