Keyboard letters to type for Greek letters on TypeGreek.com
Type afterwards for diacritics
Diacritical Marks in Black ===>>
Vowels in Red ===>>
Consonants in Blue ===>>
Chart from Unicode Classical Greek Inputter with every possible combination of letters and diacritical marks.
You can just click on what you want while using the program. That way you don't have to remember the codes