Number + 集 / Noun + 集
集 (jí) means "episode" when used as a measure word for TV shows or series, and "collection" when used as a noun for compiled works. As a measure word, it is placed after a number to count episodes. It is essential vocabulary for discussing media and literature.
这部电视剧一共有三十集,我已经看了一半。
zhè bù diànshìjù yīgòng yǒu sānshí jí, wǒ yǐjīng kàn le yībàn.
This TV series has thirty episodes in total, and I've already watched half of them.
昨晚播的那集太精彩了,我看了两遍。
zuówǎn bō de nà jí tài jīngcǎi le, wǒ kàn le liǎng biàn.
Last night's episode was so amazing that I watched it twice.
这本书是鲁迅作品集,收录了他最著名的文章。
zhè běn shū shì lǔxùn zuòpǐnjí, shōulù le tā zuì zhùmíng de wénzhāng.
This book is a collected works of Lu Xun, containing his most famous writings.