The "Resteem" button is the arrow in front of the "Reply" button. It's like the equivalent of sharing someone's post to your timeline, on Facebook.
When you like a post (and want to show it to your followers), you can resteem it so that it'll appear on your "blog." Moreover, posts can only be resteemed up to 1 week (I think?) after they were published; the button will then disappear.
The "Resteem" button is the arrow in front of the "Reply" button. It's like the equivalent of sharing someone's post to your timeline, on Facebook.
When you like a post (and want to show it to your followers), you can resteem it so that it'll appear on your "blog." Moreover, posts can only be resteemed up to 1 week (I think?) after they were published; the button will then disappear.
it benefits the one who posted it right ?
Yes.