Domain names are often seen in analogy to real estate in that domain names are foundations on which a website can be built, and the highest quality domain names, like sought-after real estate, tend to carry significant value, usually due to their online brand-building potential, use in advertising, search engine optimization, and many other criteria.
Dedicated server is a physical server that you can lease from the hosting provider. This allows you to have full control over the server including the choice of operating system, hardware etc. You DO NOT need a dedicated server if you are just starting out. Once your site is receiving a significant amount of traffic, only then you should consider upgrading to a dedicated server. WPBeginner runs on a dedicated server by HostGator. If you do not employ a system administrator or have no experience with servers, then we recommend that you get a managed dedicated server. WordPress hosting providers who offer managed dedicated servers employ full-time system administrators that maintain your servers. Along with doing software updates, they also do server monitoring, offer phone support etc. Most top websites use clusters of dedicated servers.