If you have a VPS with cPanel installed, see below! There are a ton of links to how-tos, tips and tricks, etc.
Note: if you have a Developer VPS, please visit the Developer VPS section.

Quick Start Guides

Transfer a cPanel account to a New VPS
Set Up a New VPS

Apache/PHP

How to configure and update Apache
Advanced Apache/PHP Configuration
Run Multiple Versions of PHP

DNS

Set Up Custom Nameservers

Email

Tutorials

Backups

Set Up Automatic Backups
Back Up Your VPS or Dedicated Server

Misc. Guides

Install an SSL Certificate
Enable AWStats Update From cPanel
Disable Mailman on a VPS
Basic VPS Maintenance

Errors

Invalid License File Error
Connection Dropped by IMAP Server
Directive Processing Error

Security

Install and Configure ModSecurity
Install ConfigServer Firewall on a Server
Secure Logins for your VPS

Tips

Enable Email Port 26

​And see more in our VPS section.