Debian is a preferred Linux release, which is used mainly on personal computers, however many people have started using it lately as a web server OS as well, because of the stability and security it offers. The latter is a direct result the fact that Debian is developed and supported by thousands of qualified volunteers internationally, which means that any patch that is required to fix a certain issue is released within a couple of days. The very same community will also help you with any question or problem which a user may ever experience, because they can be contacted through electronic mail using e-mail lists and a competent response will be sent in around 15-20 min. The advantage here is that your questions will be addressed by the same people who have designed the Operating System itself and they have a detailed knowledge of how it works. As Debian is provided for free, you won't have to pay any license fees to use it and you can customize it as much as you want or need. This is valid for both the Operating System and the 30.000+ software packages that are available for it.