When you choose dedicated hosting, then you get advance technical support from the hosting service provider. There are 3 types of management in dedicated server: unmanaged, semi managed & fully managed server. In un-management, total technical support is on you. But in semi management, some of technical support is provided by the service provider for some specific queries & in fully management total technical support is provided by Technical support professionals quickly with 24/7*365 support. They provide you the information & advice which you have to know to keep your website up.