If you’re literate in any language with a Latin script then you’ve learned your ABCs. Good job, considering it’s a completely random ordering of elements. The English alphabet is taken from the Roman script, which itself was taken from earlier Greek scripts that go back a good 3000 years to the Phoenicians. No one has a half-way plausable theory as to why that order was decided upon, but it’s hardly changed since the earliest records, except for when a language added, modified or removed a character. Although it has a venerable history there isn’t much of a system about it. In this respect the Devanagari alphabet is a much more elegant system. This alphabet was set up in the 11th century by Sanskrit grammarians who based it on phonetic principles. Check out the chart below from Ancient Scripts: We start off with the vowels, but it’s the consonants where the fun is. We start with the velar position, and move through voiceless (aspirated and not), voiced (breathy and not) then nasal. Move your way though the mouth from back to front as you go down the alphabet - you’ve got your alveo-palatal affricates, then your retroflexed, alveolar and bilabial stops before your grab-bag of approximents and fricatives. Devanagari script and modifications of it are used throughout India, Nepal and Tibet. Even if you don’t use the script you can’t help but admire it.