WHM has a great many of its settings listed on the Tweak Settings page. Most of them can and should be left as the defaults. Nevertheless, let's take a look.

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There are far too many settings here for us to cover them in detail. If a setting's description isn't adequate enough for you to be certain of its purpose, it's generally safest to leave the setting alone. Note that a lot of these settings can be changed elsewhere in WHM.
At some point in time, you or your clients might run into trouble adding a domain name to your server. Changing some of the settings under Domains may get rid of your problems.

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Most of the mail settings are fine left alone.

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You might want to disable one of the webmail programs, for whatever reason. That can be done here.

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If your clients complain that their PHP applications can't connect to the database, you may need to enable "old style passwords" here.

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You'll likely to want to customize the settings under Notifications. Some settings apply to notifications sent to admins or resellers, while some apply to those sent to end-users.

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Most of the PHP settings can also be changed using its INI file, or the section of WHM dedicated to PHP.

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The Redirection settings can be useful, particularly the last one.

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You shouldn't need to touch the Security settings. For details on how to secure your server, watch the previous tutorial.

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Here, you can enable or disable Software and Stats programs.

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You might want to tweak the Stats and Logs settings, for minor adjustments in functionality.

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These settings control Server Status information, cPanel Support, and System-related functionality.

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The last settings pertain to any cPAddons you might have installed.

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The Notes at the bottom of this page may apply to some of the settings you're interested in changing.

1) When you're finished here, click Save.
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As you might guess, saving that huge list of settings will take a moment.

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When it finishes, you'll see the word Done. Your settings have been saved.

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This is the end of the tutorial. You now know how to use the Tweak Settings page in WHM.