This is the 17198th most frequent Russian word.
страница
Page.
Here, "страница" means a single side of a sheet in a book or similar item, indicating its literal meaning.
Я открыл новую страницу в книге.
I opened a new page in the book.
In this sentence, "страница" refers to parts of a website, showing its usage in a digital context.
На сайте было несколько страниц с полезной информацией.
There were several pages with useful information on the website.
Here, "страница" is used metaphorically to signify a new phase or period in one's life.