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There's also the youtube subscription page. https://www.youtube.com/feed/subscriptions

If you only use youtube to watch videos posted by your subscribed channels, then go to the page that youtube fills exclusively with all of the videos posted by your subscribed channels. It's wild to me how many people use the homepage to consume their subscriptions.

For specific playlists: https://www.youtube.com/feeds/videos.xml?playlist_id=<playli...

this is an excellent tip for someone who doesn't want to sign up to youtube/google just to be able to follow a channel.

I’m getting a 404.

See where the OP put <channel_id>?

You have to copy and paste the YouTube channel ID into that space, and then you can use the whole URL in an RSS feed reader.