WHM has around two hundred screens, and a reseller uses perhaps fifteen of them. The rest are either for server administrators with root access, or for situations you will meet once a year. Knowing which fifteen turns a panel that looks impenetrable into something you navigate without thinking.
This is a map: what each section is for, which screens inside it you will actually open, and how WHM divides from cPanel so you stop going to the wrong one.
The division that matters
WHM is yours and cPanel is your client's. Every account you create gets its own cPanel; none of them ever see WHM.
The practical rule: WHM decides what an account is allowed, cPanel does things within those limits. "The client needs another database" is cPanel. "The client should be allowed more databases" is WHM.
Going to the wrong panel first is the most common way ten minutes disappears, and it stops happening once that sentence is fixed in your head.
One feature bridges them, and it is the single most useful thing in WHM: from List Accounts, clicking the cPanel icon beside any account opens that account's cPanel with full access and no password. You never need to ask a client for their credentials, and you should never train them to send you any.
Account Information
Where daily work starts.
List Accounts is your inventory: every account you host, searchable, with disk usage against quota, and one-click access into each cPanel. Bookmark this one.
Show Accounts Over Quota is the highest-value screen in WHM for a reseller. A full account cannot write anything, and the client experiences that as several unrelated failures at once: email not arriving, uploads failing, forms breaking. Checking this weekly catches problems before they are reported.
View Bandwidth Usage shows transfer per account. Useful less for enforcement than for noticing the account whose traffic tripled overnight, which is rarely good news.
Account Functions
Everything that changes an account lives here.
Create a New Account for one at a time. Create Multiple Accounts for a list, see creating multiple cPanel accounts at once.
Modify an Account changes one account's limits and leaves its package alone. Upgrade/Downgrade an Account applies a different package wholesale, replacing every limit: including any individual adjustment you made earlier. Confusing these two is how resellers silently lose settings they configured for a reason.
Suspend/Unsuspend takes an account offline while keeping all its data. It is reversible in seconds, which makes it the right tool whenever you are unsure.
Terminate an Account deletes everything permanently. WHM asks once. There is no undo without a backup you took beforehand.
Transfer or Restore a cPanel Account brings an account in from another host with files, email, databases and DNS intact.
Packages
A package is a template of resource limits, and every account is created from one. Three screens: add, edit, delete.
Two things about editing catch people. Changing a package does not change accounts already created from it: existing accounts keep their limits until you reapply the package to each one individually. And deleting a package does not delete or change its accounts; they simply stop belonging to any package.
Keep the number small. Three packages is usually right, and nine becomes a support burden because you cannot remember what each one allows.
DNS Functions
Where you edit DNS records for client domains.
Edit DNS Zone is the one you will use, adding a record for a mail service, pointing a subdomain elsewhere, fixing a record a client got wrong.
The others (adding and deleting zones) usually happen automatically when accounts are created and terminated. Editing zones by hand is for exceptions, and it is worth being careful: a wrong record takes a domain offline until the mistake propagates back out.
Server Configuration
Mostly root-level and not yours, with one exception you must visit.
Basic WebHost Manager Setup holds your nameservers and the contact address WHM sends notifications to. Both matter, and both are set once.
Set the contact address to something you read, and not a mailbox hosted on the reseller account itself: when the account has a problem you want the notification to arrive anyway.
Branding and support settings
Your clients see cPanel constantly. Leaving it unbranded tells them exactly whose infrastructure they are on.
The customisation settings control the logo in cPanel, where that logo links, and the support contact details clients see. The support contact matters more than the logo: if a client can find a route to the upstream host, some will use it, and you find out about your own problems second-hand.
Customising branding goes into all four places the arrangement can leak.
What you will not have
A reseller account is not root. Screens for restarting services, changing server-wide PHP settings, managing the firewall, editing Apache configuration and installing software are either absent or refuse the operation.
That is the trade of the tier, and it is a good one: you get administrative control over accounts without becoming responsible for patching and securing an operating system. When you genuinely need those screens, the answer is a VPS with root access, and the maintenance work that comes with it.
Finding things
WHM's search box at the top left is faster than the menu, and it searches screen names. If you know roughly what a feature is called, type it rather than hunting through sections. The grouping is not always where you would expect, and it differs between versions.
For the panel your clients use, the cPanel introduction goes into the other side of the same account.
For reading the health screens specifically, WHM Service Status and Server Health for Resellers walks through what each figure means.
For editing zones and records from WHM rather than from an account, WHM DNS Functions: Editing Zones and Records goes over those screens.
A handful of server-wide settings are worth changing on almost every machine. There is more in WHM Tweak Settings Worth Changing.
From the account list you can also enter any account's control panel directly, which is how most reseller support actually gets done. How to Open a cPanel Account from WHM Without a Password picks it up from there.
