This is the 2386th most frequent Turkish word.
gördükleri
"Things they saw" or "what they saw."
In this sentence, 'gördükleri' specifies 'everything that they saw,' functioning as a noun derived from 'görmek'.
Gördükleri her şeyi not ettiler.
They wrote down everything they saw.
Here, 'gördükleri' refers to 'the dream that they saw,' combining the verb 'görmek' (to see) with a possessive ending linking it to the plural subject.
Gördükleri rüya çok ilginçti.
The dream they saw was very interesting.
Here, 'gördükleri' describes the noun 'tablo' (painting), indicating that the object of their liking is what they had seen.