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I’ve created a community for free game offers
(feddit.uk)
A gaming community free from the hype and oversaturation of current releases, catering to gamers who wait at least 12 months after release to play a game. Whether it's price, waiting for bugs/issues to be patched, DLC to be released, don't meet the system requirements, or just haven't had the time to keep up with the latest releases.
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tl:dr; rss is a standard format for updates (think title, description, link). Think about rss updates as emails and an rss reader as an email inbox
How and where do you subscribe to rss?
You can use one of the bunch of RSS feed readers to do that. I haven't use it for years (basically since I lost everything I had on Google reader) so I cannot recommend you any apps