# Core Concepts

- [Users](https://docs.church.directory/core-concepts/users.md)
- [Login Methods](https://docs.church.directory/core-concepts/users/login-methods.md): Church Directory offers 3 different methods of logging in for members:  email, username and phone number.
- [Account Membership](https://docs.church.directory/core-concepts/users/account-membership.md): Account membership terminology can be confusing based on other systems use of this language. We'll try to clear that up here.
- [Family Units](https://docs.church.directory/core-concepts/users/family-units.md): Family units in Church Directory are a key part of how information is displayed throughout the app, especially in regards to the Directory.
- [Family Emails](https://docs.church.directory/core-concepts/users/family-emails.md)
- [Church Offices](https://docs.church.directory/core-concepts/users/church-offices.md): A "church office" (sometimes called a "church role" in congregations) are titles such as "Elder", "Deacon", "Minister", "Evangelist", etc.
- [Groups](https://docs.church.directory/core-concepts/groups.md): Groups are a special and import part of Church Directory for organization and communication.
- [Group Posts](https://docs.church.directory/core-concepts/groups/group-posts.md): Group Posts is a super-low cost communication platform built right into Church Directory.
- [Texting (SMS)](https://docs.church.directory/core-concepts/groups/texting-sms.md): Church Directory allows your congregation to text groups. The texting tool, utilizing a dedicated toll-free number, is meant for one-way communication to mobile numbers stored in the
- [SMS and Text Encoding](https://docs.church.directory/core-concepts/groups/texting-sms/sms-and-text-encoding.md): SMS messages use a special and limited character set.
- [Texting (MMS)](https://docs.church.directory/core-concepts/groups/texting-mms.md): Church Directory also allows your congregation to text groups for quick communication via MMS.
- [E-mailing](https://docs.church.directory/core-concepts/groups/e-mailing.md): Church Directory allows your congregation to email groups for easy communication.
- [Email Costs](https://docs.church.directory/core-concepts/groups/e-mailing/email-costs.md): Why do you charge for emails?  Shouldn't emailing be free?
- [Voice Calls](https://docs.church.directory/core-concepts/groups/voice-calls.md)
- [Numbers for SMS & Voice Calls](https://docs.church.directory/core-concepts/groups/numbers-for-sms-and-voice-calls.md)
- [Messaging Policies](https://docs.church.directory/core-concepts/groups/messaging-policies.md)
- [Communication Use Policy](https://docs.church.directory/core-concepts/groups/messaging-policies/communication-use-policy.md): Church Directory has strict use policies for sending emails, SMS and voice calls.
- [SMS message length limits](https://docs.church.directory/core-concepts/groups/messaging-policies/sms-message-length-limits.md): Church Directory follows the technical 160 character limit per SMS.
- [Roles](https://docs.church.directory/core-concepts/roles.md): Roles are different from Groups in that they are only used determine what access a user account has to Church Directory.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.church.directory/core-concepts.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.