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How does WP decide how to display a page

I am new to WP. I tried reading up as much as I possibly can online, and via browsing through the files. As far as I can tell, no physical pages/links are stored on the disk, so when a page is created, the data is stored in the wp_posts table, and the post metadata is in the wp_postmeta table. My questions are:

  1. I am assuming that nothing is stored to disk, with the exception of uploads that go into the wp-contents/uploads directory. Is this correct?

  2. Are there any other tables involved in the posts? as in, if I delete the post from the wp_posts and all relevant data from the wp_postmeta, does that get rid of the post?

  3. How does WP know if this is a page or a post? which table is that info stored in?

  4. Are the wp_comments and wp_commentmeta tables the only tables involved in comments. As in, if I write as script to delete a comment from this table, along with its metadata, will that completely eliminate the post?


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