# Understanding fields

Learn about the different fields and custom field types, how to add fields to your project, and how to manage custom fields.

## Links

* [About text and number fields](/en/enterprise-server@3.22/issues/planning-and-tracking-with-projects/understanding-fields/about-text-and-number-fields)

  You can add custom text and number fields to your project.

* [About date fields](/en/enterprise-server@3.22/issues/planning-and-tracking-with-projects/understanding-fields/about-date-fields)

  You can create custom date fields that can be set by typing a date or using a calendar.

* [About single select fields](/en/enterprise-server@3.22/issues/planning-and-tracking-with-projects/understanding-fields/about-single-select-fields)

  You can create single select fields with multiple options, each with a description and a color, that can be selected from a dropdown menu.

* [About iteration fields](/en/enterprise-server@3.22/issues/planning-and-tracking-with-projects/understanding-fields/about-iteration-fields)

  You can create iterations to plan upcoming work and group items.

* [/about-issue-fields](/en/enterprise-server@3.22/about-issue-fields)

* [About parent issue and sub-issue progress fields](/en/enterprise-server@3.22/issues/planning-and-tracking-with-projects/understanding-fields/about-parent-issue-and-sub-issue-progress-fields)

  You can show an issue's parent issue and view sub-issue progress in your projects.

* [/about-pull-request-fields](/en/enterprise-server@3.22/about-pull-request-fields)

* [About the issue type field](/en/enterprise-server@3.22/issues/planning-and-tracking-with-projects/understanding-fields/about-the-issue-type-field)

  You can show the type of the issue in your projects.

* [Renaming custom fields](/en/enterprise-server@3.22/issues/planning-and-tracking-with-projects/understanding-fields/renaming-custom-fields)

  Learn about renaming existing custom fields in your project.

* [Deleting custom fields](/en/enterprise-server@3.22/issues/planning-and-tracking-with-projects/understanding-fields/deleting-custom-fields)

  Learn how to delete a custom field from your project.