The recommended section are for the general list and comes from your follows relays. If your follows use, we assume it could be good for you as well.

General are all the relays amethyst uses to get posts for you. That list is only for you.

Outbox is where your posts are stored, so other people can download them.

Inbox is where everybody should send replies to your posts and all your followers can download from them to see replies to you.

The other section are less relevant to this discussion.