This is the 1553rd most frequent Turkish word.
kalitesi
"Kalitesi" means "its quality" or "the quality of it" in English.
Here, 'kalitesi' is used to describe the attribute 'quality' of 'food' (yemek) possessed by 'this restaurant' (bu restoran).
Bu restoranın yemek kalitesi harika.
The quality of food in this restaurant is excellent.
In this sentence, 'kalitesi' expresses the level of superiority or standard of 'education' (eğitim) which affects 'the society’s future' (toplumun geleceği).
Eğitimin kalitesi toplumun geleceğini belirler.
The quality of education determines the future of the society.
Here, 'kalitesi' signifies the degree of excellence of the 'material' (malzeme) of 'these shoes' (bu ayakkabılar).