Hello guys!
Welcome to Steemit!
The Steemit platform enables each users content to be monetized thru the use of the steem blockchain. Each users can upvote or it is the same as the like button in other social media site, in order to give a certain rewards for a specific post, but the worth of upvote can varies according to each user's Steem Power SP. You can increase your SP by converting your Steem to SP, or you can just use the blocktrades.us to delegate or rent some SP for 90 days. Increasing your SP, means you are adding more value to the steemit community. As a good result, more people will most likely to engage and interact with your activities here in Steemit.
It works like a share button in other social media site. Once you resteemed a post, it will going to appear in the newsfeed of your followers and will going to be featured in your blog post too. Make sure to be responsible in using the resteem button, because your follower doesn't want to see too much resteemed post from you, remember that the quality of content is subjective. It might appear just like a spam in your follower's feeds, just resteem only the interesting or useful post only.
For more questions, you can also read the Steemit's FAQ
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