This is the 9302nd most frequent Korean word.
것들은
"것들은" means "things" or "objects" in a plural form, often with a derogatory or dismissive tone depending on context.
In this sentence, '것들은' refers to the 'things' or 'items,' specifically the materials mentioned later in the sentence.
이것들은 모두 선생님이 준비한 자료들입니다.
These are all materials prepared by the teacher.
Here, '것들은' points to 'those things,' describing tools meant for future use.
저것들은 우리가 나중에 사용할 도구들입니다.
Those are tools we will use later.
In this case, '것들은' refers to 'things' abstractly, emphasizing the potential of any conceivable idea.