What is fascinating is that the origin of modern writing as we use it today whatever the language, dates from -3300 years before Jesus Christ and that it was only small drawings, engraved pictograms in clay with reed feathers cut by the Sumerians, living in a country which was located between two rivers the Tigris and the Euphrates, in place of what is today Iraq. They evolved their writing using more perfected forms, more precisely wedge-shaped, cuneiforms.
If today the shape of a letter seems obvious to us, this is not the case, our writing system is simply made up of simplified symbols, these graphemes are called letters which in reality represent a sound, a phoneme!
Throughout the world there are several alphabets which can nevertheless relate to the same phonetics, the main ones are the Latin, Cyrillic, Greek, Armenian, Georgian and Hangul alphabets, the Latin being that of the French, I am not telling you anything.
There are also "logographic" alphabets, namely syllabic, Hanzi, Kana and Hanja. We find "abjads", writings composed mainly of consonants like Arabic or Hebrew. Finally there are "abugida" alphabets, i.e. alphasyllabary, halfway between a syllabary and a classical alphabet, the Brahmic of the North and the South, the Geeze, the Thaana and the Canadian Syballary.