With 38,000 Newsgroups feeding into a news server daily, there is usually a time expiration limit to a particular article, once it is posted. The list is kept current by volunteers and can be obtained from news.announce.newusers for most of us when we first use an application program which reads Netnews. The best method of obtaining the complete list is simply to load and run the application which reads them from the news server. News reader applications have been developed for our Windows GUI interfaces as well now. The news reader applications have the capacity to help sort through this list to find subjects of interest.
Most news readers have FIND utilities built-in to assist in sorting through the list.
Use the FIND utility to select one or two subjects as starting points. This selected list then becomes the short list from which the application will obtain Newsgroup articles for your review. I have set two separate applications up on my machines for different uses. One is the Microsoft Outlook and the other is Free Agent. They both provide me experience in using Netnews.