This is the 14807th most frequent Turkish word.
rüzgarının
"Of its wind" or "of the wind."
In this sentence, 'rüzgarının' indicates possession ('the wind's'), describing the direction ('the wind's blowing direction').
Rüzgarının estiği doğrultuda yelken açmalıyız.
We must set sail in the direction the wind is blowing.
Here, 'rüzgarının' again signifies possession; it shows that the described 'strenght' belongs to 'the wind'.
Rüzgarının gücünden dolayı uçurtmayı zar zor kontrol edebildik.
Due to the wind’s strength, we could barely control the kite.
In this instance, 'rüzgarının' indicates possession, referring to 'the coolness brought by the wind'.