I am very interested in learning the language.
I have given a sight at the material in the web.
I would ask You something that is not very clear considering courses, dialogues
and so on, that is the translation of 'and'.
Reading through above mentioned materials I have found two translations: KO and
AY.
Is there any difference or which is the best or the exact one?
Thank You very much in advance for Your kind answer.

Regards