> For the complete documentation index, see [llms.txt](https://swallow-1.gitbook.io/swallow/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swallow-1.gitbook.io/swallow/your-first-model/essential-concepts.md).

# Essential concepts

- [Syntax](https://swallow-1.gitbook.io/swallow/your-first-model/essential-concepts/syntax.md): This is the structure of the language you'll be using to code nearly all steps and decisions in your pricing model, writing rules, filtering data, looking up variables and applying transforms.
- [Steps](https://swallow-1.gitbook.io/swallow/your-first-model/essential-concepts/steps.md): Steps are the core of our drag-and-drop price builder
- [Collections](https://swallow-1.gitbook.io/swallow/your-first-model/essential-concepts/collections.md): Using Collections to dynamically query large data sets
- [Try Model](https://swallow-1.gitbook.io/swallow/your-first-model/essential-concepts/try-model.md): Interact with your model from anywhere in your project
- [Spotlight](https://swallow-1.gitbook.io/swallow/your-first-model/essential-concepts/spotlight.md): Find anything in your model, on any page, by using the Spotlight tool