This is the 13165th most frequent Turkish word.
katkısına
"Katkısına" means "to its contribution" in English.
Here, "katkısına" is used as a noun in the dative case to link the subject (John's contribution) with the action of valuing.
John'un projeye yaptığı katkısına çok değer veriyoruz.
We highly value John's contribution to the project.
In this sentence, "katkısına" signifies the contribution that something (unmentioned subject) made towards the team's success.
Şirket, takımın başarısındaki katkısına teşekkür ediyor.
The company thanks for the contribution to the team's success.
Here, "katkısına" highlights the notion of a contribution directed towards the field of education as a part of demonstrating its significance.