This is the 18259th most frequent Russian word.
чужих
"Чужих" means "others" or "strangers" in English, often implying someone foreign or unfamiliar.
Here, 'чужих' is the plural genitive form of 'чужой', indicating 'belonging to others', used to describe the mistakes of other people.
Я избегаю чужих ошибок.
I avoid others' mistakes.
In this sentence, 'чужих' functions as an adjective describing 'людей' (people), implying people who are not ourselves or not related to us—'other people'.
Давай не будем вмешиваться в дела чужих людей.
Let's not interfere in the affairs of other people.
Here 'чужих' again denotes 'belonging to others', referring to the glances or looks directed by other people towards him, signifying an external source.