What you're asking about is basically an implementation detail of how event sheets are saved to disk. Knowing more about that won't help you achieve your stated goals. For example if you know the ID for some specific action in the event system, that has no correlation to the equivalent in JavaScript or TypeScript coding. It won't help you, and may actually hinder you, with progressing on to coding - instead I would recommend our Learn JavaScript in Construct tutorial series.
Further these IDs are just how Construct saves things to disk, and don't actually tell you anything about how the event system runs those event blocks. A better way to learn about that would be to inspect the documentation and make some exploration projects that test how Construct actually runs various combinations of event blocks.
So I'm afraid I don't think it would actually help you to answer your question!