Choose heading levels that express the relationship between the page topic and its sections. Do not use heading tags solely for font size. A scan of the headings should reveal the explanation’s structure.
For example, separate acquisition costs from operating conditions, then add subordinate headings where detail requires them. Question headings suit sections that actually answer those questions.
The content determines the number of H2s. There is no universal recommendation of five to ten per article. Use keywords naturally where they help describe a section accurately.