SEO is Search Engine Optimization. I want to ask a simple question from this domain.
My website is "First Page" on Google.
My website is "Page One" on Google.
Which one of these is right?
maybe this can help you : "My website is on the first page of google search results"
I don't think either of these properly convey what I think you want to say, because it is ambiguous.
If you want to say you outperform all other sites for a particular search,
If you want to say your site is on the first page of Google's search results for XYZ,
If you want to rank your suggested phrases, I would say "(the) first page" is more idiomatic than "page one" in most contexts.
I had the privilege to work with SEO in my past. We used to say -
Our website is on the first page of the SERPs (Search Engine Result Pages)
Hope this may work.
However, as the other answer says, there could be many ways to tell that.