First of all you want to install elfeed, if you have use-package it is easy, otherwise you have to do something like M-x package-list-packages M-x is Meta and x (meta is most likely Alt on a pc, I think Option on mac, but I don't use a mac so I don't know.) Then you can just search (C-s) for elfeed.
When you have the package you will need to do some configuration of the package, for one it would be a good idea to define some keybindings for the package.
(define-key global-map (kbd "C-c f r") 'elfeed)
Kind of like that, that is you will press C-c followed by f followed by r. This will open up your feed reader, but at this moment it will be rather boring since it will probably have no feeds, or perhaps have a gnu feed or something.
To add a feed
(setq elfeed-feeds '("https://archlinux.org/feeds/news/" "https://planet.gnu.org/rss20.xml"))
You can technically add plain words not in strings after each url, to tag the feed.
Besides this there is a lot of keybindings to know to use inside elfeed.
I will just list a few of the more useful keybindings here
Return If you hit return or enter, you will open the highlighted entry, here you can hit n to go to the next article p to go back, and q to quit
b This should open the highlighted entry in your browser
u/r With this you can mark as either read or unread
y Allows you to copy the url to the clipboard.
G This will update your feeds.
I don't think there is that much more to cover about elfeed.