The single main heading of a page — the spine that describes what the page is about.
Every page should have exactly one H1 that describes its subject in terms a person would actually search. Common mistakes are no H1 at all (the strongest on-page signal is missing), multiple competing H1s, or a vague brand-only H1 like "Welcome."
Fixing the H1 is often the single highest-impact on-page change, precisely because so many pages get it wrong.
GoodAircon Cleaning Services in Cebu City
WeakWelcome to Our Website
The good H1 states the service and place a searcher actually types; the weak one tells search engines nothing.
What to do about it
Give the page one H1 that names what it's about, the way a customer would search for it. If your report flags a missing or duplicate H1, that's usually a quick win worth doing first.
Common questions
Can a page have more than one H1?
Technically modern HTML allows it, but for SEO clarity stick to one H1 that states the page's main subject. Use H2s and H3s for the sections beneath it.
Is the H1 the same as the title tag?
No. The H1 is the main heading on the page itself; the title tag is what shows in the search results and browser tab. They can be similar but serve different places — see Title tag & meta description.