What are the benefits of resteem of a blog in steemit?

I recently got to know about resteem of a blog in steemit. I am new to this platform so any one who are doing so and know all the benefits of resteem please reply us because it will be helpful to all newbies like me those who are coming here monetize their content in this forum.

I have seen many blogs which are having $100 and above are resteemed many times by various authors so doing this, how they are getting benefited.

Please provide all of your suggestions those who are really think that it is one type of advertisement to get good reputation among all steemitians blogger.