These definitions should help you understand most of the options you see in your WHM reseller account.
Server Configuration
Basic cPanel & WHM Setup – Displays your basic server settings
Change Root Password – Changes your root password
Configure cPanel Cron Jobs – Allows you to configure Cron jobs that will run as the root user
Initial Quota Setup – Enables Quota management on machines that have a kernel that doesn't support quotas
Server Time – Set the server timezone/sync the time
Statistics Software Configuration – Enables you to customize the statistics settings
Tweak Settings – Many tweaks to increase/decrease server responsiveness
Update Preferences – Configure the way your server will be updates
Support
Create Support Ticket – Open a support ticket for cPanel WHM support directly
Grant cPanel Support Access – Grant access to cPanel support staff
Support Center – cPanel Support
Security Center
Apache mod_userdir Tweak – Allows users to view their sites by entering a tilde (~)
Compiler Access – Allows you to deny access to the compiler for unprivileged users
Configure Security Policies – Provides the configuration settings to cpanel, webmail, and WHM
cPHulk Brute Force Protection – Allows you to change the brute force protection rules
Host Access Control – Allows you to define rules to allow or deny access to your server and services
Manage External Authentications – Manage authentication providers and authenticated users
Manage root's SSH Keys – Allows you to generate a new SSH key or import one
Manage Wheel Group Users – Sets system Power User Permissions/Group
ModSecurity Configuration – Configure global settings for ModSecurity
ModSecurity Tools – Install and manage ModSecurity rules
ModSecurity Vendors – Install and manage your ModSecurity vendors
Password Strength Configuration – Allows you to modify the required password strength
PHP open_basedir Tweak – Prevents from opening files outside their home directory (if enabled)
Security Advisor – Performs a quick security check
Security Questions – Allows you to set a security question for when you access the system from a unrecognized IP
Shell Fork Bomb Protection – Prevents users with Terminal/SSH access from using up all the systems resources
SMTP Restrictions – Configure your server so that only specified users and daemons can connect to remote SMTP servers
SSH Password Authorization Tweak – Allows you to enable/disable SSH password authentication
Traceroute Enable/Disable – Enable/Disable statistics from the server to another host
Two Factor Authentication – Configure two factor authentication
Locales
Configure Application Locales – Customize the language in which the system displays a user's locale
Copy a Locale – Duplicate a locale into a standard locale or a non-standard locale
Delete a Locale – Delete a locale
Edit a Locale – Edit a locale
Locate XML Downloads – Download a locale for editing
View Available Locales – Shows a list of available locales
Clusters
Configuration Cluster – This is for configuring a Cluster (set of servers)
DNS Cluster – Allows you to enable DNS clustering
Remote Access Key – Helps setup a Remote Access Key
Server Status
Apache Status – Displays the status of the Apache Web server
Daily Process Log – Displays information about your server's overall usage of resources
Server information – Displays the server information
Service Status – Shows the status of services and the server
Account Information
List Accounts – (IMPORTANT) This lists all the accounts you have created
List Parked Domains – Shows a list of Parked Domains
List Subdomains – Shows a list of subdomains
List Suspended Accounts – Shows a list of all accounts you have suspended
Show Accounts over Quota – Shows a list of Accounts that have exceeded their Quota
View Bandwidth Usage – Shows you the total bandwidth usage
Account Functions
Change Site's Ip Address – Allows you to change a sites Ip Address if you have any available
Create a New Account – (IMPORTANT) This allows you to create an account enter the details and then click Create and you'll have added a account
Email all users – Sends an email to all your users
Force Password Change – Allows you to force password changes
Limit Bandwidth Usage – Allows you to limit a accounts bandwidth usage
Manage Account Suspension – Allows you to suspend/unsuspend an account
Manage Demo Mode – Allows you to Enable/Disable Demo Mode of cPanel/WHM
Manage Shell Access – Manage what users have Shell access
Modify an Account – Allows you to modify a account
Password Modification – Changes a accounts password
Quota Modification – Allows you to modify a account's disk quota
Raw Apache Log Download – Download the raw Apache Log
Raw FTP Log Download – Download the raw FTP logs
Rearrange an Account – if your server allows you can modify an account's mount point
Reset Account Bandwidth Limit – Resets all account bandwidth limits
Show Active and inactive Accounts – Lists all active and inactive accounts
Skeleton Directory – Allows you to make a custom page setting it so that any new accounts will have a default look/page
Terminate Accounts – Completely removes account including data
Unsuspend bandwidth Exceeders – Unsuspends users who are over their bandwidth limit
Upgrade/Downgrade an Account – Gives you the ability to upgrade and downgrade an account
Web Template Editor – Allows you to create placeholder web pages
Multi-Account Functions
Change multiple Sites' IP Addresses – This allows you to change the IP addresses of multiple accounts at once
Modify/Upgrade Multiple Accounts – This allows you to Upgrade/Downgrade multiple accounts at once
Transfers
Convert Addon Domain to Account – Convert an existing addon domain into a full cPanel account
Copy an account from another server with an account password – This allows you to copy an account from another cPanel server of the same version with the account password.
Review Transfers and Restores – Allows you to review previous transfers and restorations.
Transfer Tool – Copies multiple accounts from a remote server to your cPanel/WHM server
Themes
Change WebHost Manager Theme – This allows you to change the WHM theme.
Theme Manager – Manage themes
Packages
Add a Package – This allows you to create custom packages for new accounts
Delete a Package – Removes a package from being available during new account creation
Edit a Package – Modifies an existing packages resources
Feature Manager – Allows you to disable/enable features inside of each user's cPanel
DNS Functions
Add a DNS Zone – This allows you to add custom DNS Zones
Add an A Entry for your Hostname – Adds an A entry for your hostname
Delete a DNS Zone – This allows you to remove DNS Zones
Edit DNS Zone – This allows you to Edit DNS Zones
Edit MX Entry – This allows you to edit MX Records (Mail)
Edit Zone Templates – This allows you to edit the default zones that are used when creating DNS entries
Nameserver Record Report – Displays information about nameservers used by this server's zones
Park a Domain – This allows you to park current Domains
Perform a DNS Cleanup – performs a DNS cleanup
Reset a DNS Zone – (CAUTION) Allows you to Reset a DNS Zone
Set Zone Time To Live (TTL) – Permits you to set the value for time to live (TTL) in your server's DNS zones
Setup/Edit Domain Forwarding – This allows you to forward a Domain
Synchronize DNS Records – Synchronizes the DNS entries across multiple servers
Email
Greylisting – Enable or disable Greylisting for the entire server
Mail Delivery Reports – Review messages sent and received by your server
Mail Queue Manager – Allows you to clear the mail queue / deliver all items in the mail queue
Mail Troubleshooter – Will track down problems with email
Mailbox Conversion – Convert to maildir or mdbox
Repair Mailbox permissions – Corrects any problems with mailbox permissions
Spamd Startup Configuration – Configure the startup options for the SpamAssassin daemon
View Mail Statistics – Displays the mail statistics
View Relayers – This shows you the mail relays
View Sent Summary – Displays the total of message delivery attempts for each domain on the server
cPanel
Change Log – cPanel/WHM changelog
Customization – customize the branding and style that will be used for cPanel.
Install cPAddons Site Software – This allows you to add cPAddons
Manage cPAddons Site Software – This allows you to manage cPAddons
Manage Plugins – Manage available plugins
Modify cPanel & WHM News – Shows news on your users cPanel and WHM pages
Reset a Mailman Password – Reset the password for your servers Mailman mailing list without needing the previous password
Synchronize FTP Passwords – This is used to repair any FTP password issues that exist
Upgrade to Latest Version – Update your cPanel/WHM installation to the most recent version for your server's Release Tier
SSL/TLS
Generate an SSL Certificate and Signing Request – A form that requests an SSL certificate be generated
Install an SSL Certificate and Setup the Domain – Location to upload the CRT file for your SSL certificate
Manage AutoSSL – Manage the AutoSSL feature
Manage SSL Hosts – Manages your SSL hosts
Purchase and Install SSL Certificate – cPanels recommended SSL vendor
SSL Storage Manager – View in-depth information about SSL related resources
Market
Market Provider Manager – Manage products that are available to purchase via the cPanel interface.
Development
Apps Managed by AppConfig – Display apps that are installed/registered with AppConfig
cPanel Development Forum – Link to the cPanel Development Forum