the greek language
Ancient Greek, in all its dialects, is well-known both for having an extremely wide variety of texts and for being very difficult to learn. If it is one's first ancient language, it is likely that it will be very challenging, but the study of Greek is also very rewarding and ought to be very fun.
Since it is such a popular and important language, there is an absolute abundance of online resources available, and some of the best are free and open to anyone. If you know of others, please contact us.
Check out the Greek alphabet and pronunciation here.