The Greek alphabet consists of 24 letters.
The Greek alphabet was derived from the Phoenician alphabet from which the Hebrew alphabet also hd its origin.
In ancient times many Greeek works were written entirely in capital letters; these works are called uncial. Capitals are, nowadays, used for 1) proper nouns, 2) the first letter of a paragraph, and 3) to mark the beginning of a direct quote, where English would use inverted commas. They are not generally used at the beginning of each new sentence as is the convention in English.
Though you do not find the equivalent of an 'h' in the Greek alphabet, you would find it often in transliterations of Greek words. The reason for this has to do with what linguists call 'breathings,' a pair of marks one of which is written over every vowel or diphthong that begins a word. The rough breathing looks like this ‘ (a single inverted open quotation mark), and is sounded like an 'h', while the smooth breathing which looks like this ’ (a single close quotation mark), and indicates that the word is to be pronounced without the 'h' sound.
On-Line Resources
☰ Harold Greenlee, "No, You Don't Have to Know Greek," His 25 (1965): 34-35. pdf
☰ William D. Mounce, Basics of Biblical Greek Video. Chap 3: Alphabet and Punctuation. video 26:15 min.
William Mounce is an outstanding teacher. If you wish to see if learning biblical Greek is for you, try the first lesson in his series Basics of Biblical Greek video N
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