Headings

HTML uses six levels of heading tags h1 to h6; the higher the heading level number, the greater it’s importance — so h1 defines the most important heading, whereas the h6 defines the least important heading in the document

level-1

level-2

level-3

level-4

level-5
level-6

Use h1 headings as main headings, followed by h2 headings, then the less important h3 headings.