How to share pages and posts from websites to the app

Hi, can you tell me what the best (and preferably easiest) way to share content (i.e. articles, posts, pages and product listings) from existing websites with newly built appgyver apps is please? The websites are constantly being updated, so the method will need to accommodate that to ensure that all content is fresh and in sync.

Also, if there’s a way to share the data changes made by users commenting on the app etc., back to the website and vice-versa to make sure that’s in sync too, that would be great.

Thank you!