Learn Turkish: İnternet kullanımının yıldan yıla yaygınlaşması için çalışıyoruz. - We are working for internet usage to become widespread from year to year.

It uses the pattern Noun + Ablative (-dan / -den) + same Noun + Dative (-a / -e). Here, yıl (year) takes the ablative -dan and then the dative -a to form yıldan yıla, which means "from year to year" or "year by year". This structure is used to express a gradual change or progression over time.

Why are kullanımının and yaygınlaşması linked with genitive and possessive suffixes?

To say "for [something] to happen" using için, Turkish treats the action as a noun phrase. Literally, it translates to "for the internet usage's becoming widespread". The noun compound internet kullanımı gets the genitive suffix (-nın) to act as the owner, and the verbal noun yaygınlaşma gets the possessive suffix (-sı) to act as the owned item.

Why does kullanımının have so many suffixes? What are its exact parts?

İnternet kullanımı is a noun compound (internet usage), so the base noun kullanım needs the compound possessive suffix -ı. When we need to add the genitive suffix to link it to yaygınlaşması, we must insert a buffer -n- before the genitive -ın. So the breakdown is: kullanım (usage) + ı (compound marker) + n (buffer) + ın (genitive case).