Learn Turkish: Turistik yerlere hangi yönden gideceğimizi bilmiyoruz. - We do not know from which direction we will go to the touristic places.

In Turkish, indirect questions are formed using a question word (hangi) followed by a verb turned into a noun clause. Since this is about the future ('will go'), we add the future factive suffix -ecek to the verb root git-, followed by the possessive ending -imiz to show who is going ('our going').

Why does gideceğimizi end with an extra -i?

That final -i is the accusative case marker. The entire clause hangi yönden gideceğimiz (which direction we will go) acts as the direct object of the main verb bilmiyoruz (we do not know). When a specific noun clause is the object of a verb, it must take the accusative case.

Why does git- become gid-, and -ecek become -eceğ- in gideceğimizi?

This happens because of consonant mutation. When the verb root git- is followed by a vowel (the e in -ecek), the t softens to d. Similarly, the k at the end of -ecek softens to ğ because it is followed by the vowel i from the possessive suffix -imiz.

Why is it yönden (from the direction) instead of yöne (to the direction)?