Create an RSS feed of all posts

WordPress already automatically creates RSS feeds … just add /feed/ to the end of a URL

you can do this from topleveldomain.com/feed or and even from categories and tags like this topleveldomain.com/tag/sometag/feed

You should also go to WordPRess Admin > Settings > Reading and you may need to change the number of default items in your feed from 10 to 20 or more.

see also the page on the WordPress codex referenced by Amit in the comment above.

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