Ha ha, hmm, well.
Sometimes I post too fast, then I find the answer myself.
If I think the post can still be interesting, I edit it to show what I found.
But when I feel my post is dumb, bogus, cluttering, boring, aggressive, useless for the topic, etc., then I delete my post.
When you delete your post with the 
trash bin icon, it will show this text for 24 hours (I don’t remember the exact grace period):
(post deleted by author)
During this grace period, anyone can see the content of the deleted post, by clicking the 
history pencil icon.
During the grace period, you can restore your post, cancel its deletion, by clicking the 
rotating arrow icon.