A is a vowel, two sounds.
C is a letter that has no sound but either takes the sound of K or S. K as in Can and S as in rice.
D,E is another vowel.
G has two sounds. G as in good or a 'hard' G as in magic. Garage has both sounds
HI is another vowel.
NO is another vowel.
Q is nearly always used with U and has the qu sound
TU is another vowel.
X has two sounds. Most common one is Extreme (ks), and another sound as in Example (gz)
Y sometimes has a short 'I' sound as in MYTH but at the beginning of a word it has a YUH sound, such as young.
Z as in buzz or zodiac or zip
See Short and Long Vowel Sounds