This is the 10192nd most frequent Russian word.
биографии
"Biographies" - written accounts of people's lives.
Here, 'биографий' is the genitive plural form of the noun 'биография' which is used to indicate 'many of' biographies.
Я читал много интересных биографий знаменитых людей.
I have read many interesting biographies of famous people.
In this sentence, 'биографии' is the nominative plural or singular genitive form of 'биография' used possessively to denote the biography of a subject.
Её биографии на сайте неточны.
Her biography on the website is inaccurate.
Here, 'биографий' is in the genitive plural form, complementing the word 'содержание' to show possession or belonging.