> For the complete documentation index, see [llms.txt](https://developers.felt.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.felt.com/felt-style-language/getting-started.md).

# Getting started

The Felt Style Language is a way for advanced users to style data quickly, through simple JSON code. This document is a guide to use as you test data files in Felt. For an exhaustive guide to all supported properties see the Reference Documentation.

## Style definition blocks

Learn how to define and configure the code blocks that compose the Felt Style Language

{% content-ref url="/pages/ia98n0VZ2bW0rDUZjF49" %}
[Style definition blocks](/felt-style-language/style-definition-blocks.md)
{% endcontent-ref %}

## Types of visualizations

Learn about visualization types, including simple, categorical, numeric (color by & size by), heatmaps and hillshade.

{% content-ref url="/pages/t1uG4exfWZRod1VeBRFi" %}
[Types of visualizations](/felt-style-language/types-of-visualizations.md)
{% endcontent-ref %}

## Legends

Details on how to customize legends on a per-layer basis.

{% content-ref url="/pages/1fKJtssIMYNDGoHaGUKl" %}
[Legends](/felt-style-language/legends.md)
{% endcontent-ref %}

## Errors

Definitions for errors raised when validating the Felt Style Language.

{% content-ref url="/pages/X4xQjPoTGzipaOEgV5zN" %}
[Errors](/felt-style-language/errors.md)
{% endcontent-ref %}


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