The “Notes” section is just a collection of small notes, which are not required a big complete chapter or if the topic of a discussion does not touch exactly some fundamental aspects. Nevertheless, being not about fundamental topics, the notes will describe some essential questions. They can be small or still detailed.
It can be some small code snippets which can confuse or require consideration or just my meaning on some interesting ideological questions.
Generally these notes are devoted to ECMAScript, but, possibly, notes for other languages in which I interested also will be here.