Just a couple of notes/corrections to that…
To remove a post, you can use the dustbin icon on any of your posts to mark it for ‘deletion’, which will start a timer based on the delete removed posts after admin setting. Within that time the poster can fish it back out of the bin and restore it, no worries. 
Some sites do remove this option, or limit it to x in a certain amount of time using max post deletions per minute and max post deletions per day:
However, when the timer runs down they become ‘soft-deleted’, which means while they are no longer visible to everyone they are still visible to Admins, Moderators, and Category Moderators (and TL4 if you have tl4 delete posts and topics enabled):
Posts/topics on Discourse are rarely hard-deleted, and to enable this for your site you must toggle on a hidden site setting can_permanently_delete if you’d like to do it through the UI, or do it manually using the rails console.