gitara

/ɡitara/

Cases

SingularPluralWhen to use it
nominativegitarathe guitargitaralathe guitarsthe plain dictionary form — the doer of the sentence
genitivegitaranıthe guitar'sgitaralanıthe guitars'the owner — whose it is
accusativegitaranıthe guitar (as the object)gitaralanıthe guitars (as the object)a specific, known object — whom or what
dativegitarağato the guitargitaralağato the guitarsdirection or recipient — to where, to whom
locativegitaradaat / in the guitargitaraladaat / in the guitarswhere it is; also having — mende bar, "I have it"
ablativegitaradanfrom the guitargitaraladanfrom the guitarswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mygitarammy guitargitaralarımmy guitars
yourgitarangyour guitargitaralarıngyour guitars
his / hergitarasıhis / her guitargitaralarıhis / her guitars
ourgitarabızour guitargitaralarıbızour guitars
you all'sgitarağızyou all's guitargitaralarığızyou all's guitars
theirgitaralarıtheir guitargitaralarıtheir guitars

The overlap in the last rows is real, not a mistake: gitaraları can mean "his / her guitars", "their guitar", or "their guitars" — context decides.