expression
almost everyone; most people
A common set phrase meaning 'almost all people' or 'the vast majority of people'. Used in both spoken and written Japanese.
ほとんどの人がそのニュースを知っている。
Almost everyone knows that news.
パーティーにはほとんどの人が来てくれた。
Most people came to the party.
ほとんど is an adverb meaning 'almost' or 'mostly', while ほとんどの人 is a noun phrase specifically meaning 'almost everyone'.
A phrase composed of ほとんど (almost) + の (possessive particle) + 人 (person/people). The kanji 殆 is rarely used for ほとんど in modern Japanese.