One of the main reasons to integrate the news transport layer into the
newsreader is to allow greater control over what articles to download.
There's not much point in downloading huge amounts of articles, just to
find out that you're not interested in reading any of them. It's better
to be somewhat more conservative in choosing what to download, and then
mark the articles for downloading manually if it should turn out that
you're interested in the articles anyway.
The main way to control what is to be downloaded is to create a
category and then assign some (or all) groups to this category.
Groups that do not belong in any other category belong to the
default category. Gnus has its own buffer for creating and
managing categories.
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