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docs: add an overview section for the auth method docs (#5772)

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# ACL Documentation and Guides
Consul uses Access Control Lists (ACLs) to secure the UI, API, CLI, service communications, and agent communications. At the core, ACLs operate by grouping rules into policies, then associating one or more policies with a token.
Consul uses Access Control Lists (ACLs) to secure the UI, API, CLI, service
communications, and agent communications. At the core, ACLs operate by grouping
rules into policies, then associating one or more policies with a token.
The following documentation and guides will help you understand and implement
ACLs.
@ -17,37 +19,51 @@ ACLs.
### ACL System
Consul provides an optional Access Control List (ACL) system which can be used to control access to data and APIs. The ACL system is a Capability-based system that relies on tokens which can have fine grained rules applied to them. The [ACL System documentation](/docs/acl/acl-system.html) details the functionality of Consul ACLs.
Consul provides an optional Access Control List (ACL) system which can be used
to control access to data and APIs. The ACL system is a Capability-based system
that relies on tokens which can have fine grained rules applied to them. The
[ACL System documentation](/docs/acl/acl-system.html) details the functionality
of Consul ACLs.
### ACL Rules
A core part of the ACL system is the rule language, which is used to describe the policy that must be enforced. Read the ACL rules [documentation](/docs/acl/acl-rules.html)
to learn about rule specifications.
A core part of the ACL system is the rule language, which is used to describe
the policy that must be enforced. Read the ACL rules
[documentation](/docs/acl/acl-rules.html) to learn about rule specifications.
### ACL Auth Methods
An auth method is a component in Consul that performs authentication against a
trusted external party to authorize the creation of an ACL tokens usable within
the local datacenter. Read the ACL auth method
[documentation](/docs/acl/acl-auth-methods.html) to learn more about how they
work and why you may want to use them.
### ACL Legacy System
The ACL system in Consul 1.3.1 and older is now called legacy. For information on bootstrapping the legacy system, ACL rules, and a general ACL system overview, read the legacy [documentation](/docs/acl/acl-legacy.html).
The ACL system in Consul 1.3.1 and older is now called legacy. For information
on bootstrapping the legacy system, ACL rules, and a general ACL system
overview, read the legacy [documentation](/docs/acl/acl-legacy.html).
### ACL Migration
[The migration documentation](/docs/acl/acl-migrate-tokens.html) details how to upgrade
existing legacy tokens after upgrading to 1.4.0. It will briefly describe what changed, and then walk through the high-level migration process options, finally giving some specific examples of migration strategies. The new ACL system has improvements for the security and management of ACL tokens and policies.
[The migration documentation](/docs/acl/acl-migrate-tokens.html) details how to
upgrade existing legacy tokens after upgrading to 1.4.0. It will briefly
describe what changed, and then walk through the high-level migration process
options, finally giving some specific examples of migration strategies. The new
ACL system has improvements for the security and management of ACL tokens and
policies.
## ACL Guides on Learn
## Learn ACL Guide
We have several guides for setting up and configuring Consul's ACL system. They include how to bootstrap the ACL system in Consul version 1.4.0 and newer. Please select one of the following guides to get started.
~> Note: the following are located on HashiCorp Learn. By selecting
one of the guides, you will be directed to a new site.
### Bootstrapping the ACL System
Learn how to control access to Consul resources with this step-by-step [guide](https://learn.hashicorp.com/consul/advanced/day-1-operations/acl-guide) on bootstrapping the ACL system in Consul 1.4.0 and newer. This guide also includes additional steps for configuring the anonymous token, setting up agent-specific default tokens, and creating tokens for Consul UI use.
~> Note: the following guide is located on HashiCorp Learn. By selecting it,
you will be directed to a new site.
### Securing Consul with ACLs
The _Bootstrapping the ACL System_ guide walks you through how to set up ACLs on a single datacenter. Because it introduces the basic concepts and syntax we recommend completing it before starting the [Securing Consul with ACLs](https://learn.hashicorp.com/consul/advanced/day-1-operations/production-acls) which has recommendations for production workloads on a single datacenter.
In this guide, you will learn how to secure the UI, API, CLI, service
communications, and agent communications with ACLs. When securing your cluster
you should configure the ACLs first. The ACL documentation introduces basic
concepts and syntax for the ACL system, and we recommend that you read it
before you begin [this
guide](https://learn.hashicorp.com/consul/security-networking/production-acls).