WordPress has a predefined folder structure and runs on a database with a clearly defined structure. The description of the tables and the relationship between them is defined.
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You can store on the disk the plugins as well as the content that goes into /uploads, like you’ve mentioned.
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Yes, it should get rid of the post.
- in
wp_pages
table in the fieldpost_type
. You might find the template hierarchy also useful, with this you can customize posts, pages, categories etc - Yes, it should get rid of the comments