Turkish has six cases
A nominative case which carries no ending and five cases each with a typical ending. According to Vowel Harmony the vowels of the ending match the base word.
The endings of the cases are:
Genitive: -in/-ın/-un/-ün
The Genitive is the Case of Ownership
Accusative: -i/-ı/-u/-ü
The Accusative is the Direct Object of a Verb - it equates to - the.. - in English
Dative: -a/-e
The Dative is the Case of Movement Towards - it equates to - to., towards.. - in English.
Locative: -da/-de or -ta/-te - according to Consonant Mutation rules.
The Locative is the Case of Place - it equates to - in.. on.. at.. - in English.
Ablative: -dan/-den or -tan/-ten - according to Consonant Mutation rules.
The Ablative is the Case of Movement Away - it equates to - from.. by.. via.. - in English.