An Introduction to Writing Systems and Unicode

Also: UTF-8 Playground: https://utf8-playground.netlify.app

This site has been a gem for a long time for Unicode and language-related topics. Just as good to link to the top-level,

https://r12a.github.io/

The texts in the images claimed to be Simplified Chinese are not really conforming the standard glyph shapes of hanzi as defined by the government of China; they look more like the Japanese standard shapes of kanji.