Here is an outline of greek literature through the ages.
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Ancient greeks covered all genres except the novel. The most important are: Homer and the three dramatists (Aeschylus, Sophocles and Euripides) and the historian Thucydides.  And of course, the great philosophers.  The byzantine period is not important except perhaps a couple of nice religious hymns.  During the ottoman occupation, a lovely folk poetry flourishes and leads to the modern times with great poets as Kavafis, Seferis (Nobel 1969), Elytis (Nobel 1979) and writers as Papadiamantis and Kazantzakis.
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- There are thousands of sites on greek literature.  Most of them concern ancient texts.  Resources for classicists are endless, personal pages numerous.  Much less exists on byzantine and new-times corpora.  There are very few official sites with translations of modern and contemporary poetry and prose.
- My source of dates is Wikipedia Encyclopaedia.
- I present greek names in greek script, International Phonetic script and in their most common latin transliterations.
- General booklinks, texts online, at my book links.