# YAML guide

> Detailed reference overview of app settings.

Canonical HTML page: https://conclude.io/doc/developer/yaml-main/
Last updated: 2025-08-15

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## [
YAML settings
 ](https://conclude.io/doc/developer/yaml-settings)

Overview of YAML app settings.

## [
Attributes
](https://conclude.io/doc/developer/yaml-attributes)

An attribute is a data field that holds information about a ticket

## [
Select attributes
](https://conclude.io/doc/developer/yaml-attributes-select)

A select attribute lets the user choose an option from a list of up to 100 options.

## [
Custom display settings
](https://conclude.io/doc/developer/yaml-attributes-display)

Create a tag or custom display setting for an attribute.

## [
Macro substitution
](https://conclude.io/doc/developer/yaml-macros)

Insert attribute values into an app during runtime execution.