Alphabet is the key to start teaching a pupil in their early grades. Every child should get to grade 3 fully able to read and write a complete letter alphabet without stammering or hesitation. A grade 3 child should be able to read any word saying out sounds (phonics) despite knowing its meaning. (considering native/ non-native speakers) Alphabet should be taught in both Capital and small letters, just like:
Aa Bb Cc Dd Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Qq Rr Ss Tt Uu Vv Ww Xx Yy Zz.
This is important to make sure that up to grade 3, every child is literate.
Further, the vowels alphabet is also important:
Aa Ee Ii Oo Uu

Source: https://www.internationalphoneticassociation.org/content/ipa-vowels
Learn more about the history of the alphabet:
Source: http://www.usu.edu/markdamen/1320hist&civ/pp/slides/17alphabet.pdfFor future studies, here is another type of alphabet that we use in Linguistics:
The International Phonetic Alphabet.
Learn more about the International Phonetic Alphabet:
Source: https://www.internationalphoneticassociation.org/
Further reading: http://africanpridemenusavannah.blogspot.com/
Further reading: http://malalapype.blogspot.com/
Further reading: http://thekhoisanandtheovahimbatribes.blogspot.com/
Lazarus Gawazah.