Updated anatomy and teams guide (#25629)

Closes https://github.com/fleetdm/fleet/issues/24615

Updated anatomy to:
- Include a more accurate definition of teams
- Updated out-of-date links. Specifically FleetUI that linked to the
queries guide. I updated to link directly to the FleetUI YouTube video.
- Consolidated osquery, Orbit, and Fleetd Chrome extension definitions
under "Fleetd."
- Updated Host vitals and Software definitions

Updated teams guide.
- Fixed some typos and re-phrased a couple of paragraphs for easier
readability
- I provided the missing instructions for adding hosts to teams
(probably should have PR'd this separately, but got carried away)

---------

Co-authored-by: Rachael Shaw <r@rachael.wtf>

docs/Get started/anatomy.md

@@ -2,43 +2,40 @@
 This page details the core concepts you need to know to use Fleet.
 
 ## Fleet UI
-Fleet UI is the GUI (graphical user interface) used to control Fleet. [Docs](https://fleetdm.com/docs/using-fleet/fleet-ui).
+Fleet UI is the GUI (graphical user interface) used to control Fleet. [Learn more](https://youtu.be/1VNvg3_drow?si=SWyQSEQMoHUYDZ8C).
 
 ## Fleetctl
 Fleetctl (pronouced “fleet control”) is a CLI (command line interface) tool for managing Fleet from the command line. [Docs](https://fleetdm.com/docs/using-fleet/fleetctl-cli).
 
 ## Fleetd
-Fleetd is a bundle of agents provided by Fleet to gather information about your devices. Fleetd includes [osquery](https://www.osquery.io/), [Orbit](https://github.com/fleetdm/fleet/blob/main/orbit/README.md), Fleet Desktop, and the [Fleetd Chrome extension](https://github.com/fleetdm/fleet/blob/main/ee/fleetd-chrome/README.md).
-
-## Osquery
-Osquery is an open-source tool for gathering information about the state of any device that the osquery agent has been installed on. [Learn more](https://www.osquery.io/).
-
-## Orbit
-Orbit is an osquery version and configuration manager, built by Fleet.
+Fleetd is a bundle of agents provided by Fleet to gather information about your devices. Fleetd includes:
+- **Osquery:** an open-source tool for gathering information about the state of any device that the osquery agent has been installed on. [Learn more](https://www.osquery.io/).
+- **Orbit:** an osquery version and configuration manager, built by Fleet. [Learn more](https://github.com/fleetdm/fleet/blob/main/orbit/README.md)
+- **Fleetd Chrome extension:** enrolls ChromeOS devices in Fleet. [Docs](https://github.com/fleetdm/fleet/blob/main/ee/fleetd-chrome/README.md).
 
 ## Fleet Desktop
 Fleet Desktop is a menu bar icon that gives end users visibility into the security and status of their machine. [Docs](https://fleetdm.com/docs/using-fleet/fleet-desktop).
 
-## Fleetd Chrome extension
-The Fleetd Chrome extension enrolls ChromeOS devices in Fleet. [Docs](https://github.com/fleetdm/fleet/blob/main/ee/fleetd-chrome/README.md).
-
 ## Host
 A host is a computer, server, or other endpoint. Fleet gathers information from Fleet's agent (fleetd) installed on each of your hosts. [Docs](https://fleetdm.com/docs/using-fleet/adding-hosts).
 
 ## Team
-A team is a group of hosts. Use teams to segment your hosts into groups that reflect your organization's IT and security policies. [Docs](https://fleetdm.com/docs/using-fleet/teams).
+
+A team is a group of hosts. Organize hosts into teams to apply queries, policies, scripts, and other configurations tailored to their specific risk and compliance requirements. [Read the guide](https://fleetdm.com/guides/teams).
 
 ## Query
 A query in Fleet refers to an osquery query. Osquery uses basic SQL commands to request data from hosts. Use queries to manage, monitor, and identify threats on your devices. [Docs](https://fleetdm.com/docs/using-fleet/fleet-ui).
 
 ## Policy
 A policy is a specific “yes” or “no” query. Use policies to manage security compliance in your
-organization. Learn more [here](https://fleetdm.com/securing/what-are-fleet-policies).
+organization. [Read the guide](https://fleetdm.com/securing/what-are-fleet-policies).
 
 ## Host vitals
-Host vitals are the hard-coded queries Fleet uses to populate device details.
+Fleet's built-in queries for collecting and storing important device information.
 
-## Software library
-An inventory of each host’s installed software, including information about detected vulnerabilities (CVEs).
+## Software
+Software in Fleet refers to the following:
+- **Software library:** a collection of Fleet-maintained apps, VPP, and custom install packages that can be installed on your hosts. [See available software](https://fleetdm.com/app-library).
+- **Software inventory** an inventory of each host’s installed software, including information about detected vulnerabilities (CVEs). 
 
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