H1 missing

H1 is different than a meta-description. H stands for heading. Headings (H1, H2, H3...) are not just font styling, like in a word processor. Originally, they were meant to be more like the tiers of an outline, where there was only one H1 text, typically the title or topic of the page.

These days, Google is smart, and they make it clear that they can figure out your headings and a missing H1 tag isn't the end of the world. However, just from a due diligence standpoint, all the SEO audit tools still flag it. If you don't need it, it's probably not hurting your SEO.