a e i o u
b c d f g h j k l m n p q r s t v w x y z
Words are built from vowels (a, e, i, o, u) and consonants (the rest of the alphabet).
The letter 'y' is a bit different, because sometimes it acts as a consonant and sometimes it acts as a vowel.
Knowing how vowels and consonants work together to make words and sounds will help you with your spelling.