# frontier-lexicon > An interactive, layered map of modern AI concepts, from tokens to alignment research. Each concept has a plain-language theory, a hands-on exercise and the concepts you need first. Concepts are grouped by layer, from model fundamentals (layer 1) to research vocabulary (layer 10). A `PREREQUISITE_OF` edge never points from a higher layer to a lower one, so the layers double as a learning order. Every page is also available as plain Markdown at the link next to it. ## Concepts No concepts have been published yet. ## Optional - [Concept index](https://lexicon.kaganmert.com/concepts/): every concept on one page - [Full content](https://lexicon.kaganmert.com/llms-full.txt): all concept pages as one Markdown file