This is the 2652nd most frequent Russian word.
хороших
The word "хороших" is the genitive or accusative plural form of "хороший," meaning "good" in English.
In this sentence, 'хороших' is the genitive plural form of the adjective 'хороший' modifying 'друзей' (friends). It describes the friends as being good.
У меня много хороших друзей.
I have many good friends.
Here, 'хорошие' is the nominative plural form of the adjective 'хороший' used with 'книги' (books). It characterizes the books as being good.
Он всегда выбирает только хорошие книги.
He always chooses only good books.
In this sentence, 'хорошие' is the accusative plural form of 'хороший,' agreeing with 'отношения' (relations). It conveys that the relations are good in quality.