Simply stated, H1 header tags are important. But it isn’t just making sure we use H1s on webpages or even how we use them. It’s actually understanding what an H1 is (in modern definition) and how it fits into a page’s organization. More importantly, it’s knowing how an H1 – and other header tags (H2, H3, H4, etc.) – fit into the overall user experience of that page and the website as a whole.