I'm planning to learn Greek soon, but the many different dialects confuse me. I wonder two things.
a) How big are the differences? If I learn for example Attic, will I then be able to understand, say, Koine?
b) Which dialect is the most common? Which dialect is spoken here at Textkit, or are all of them used here?
I'd really appreciate some replies on this.
Also, which book available from Textkit should I use?