Three things:

* A backlink is basically a link on a website that points to your site.
* Guest posting is only one form of link building.
* Link building is basically a strategy to build backlinks.

Now, the point isn’t just to win backlinks, you should aim to get **high-quality** and **relevant** links back to your site.

This way, you’d actually see results in the long run.

In short, please be careful with shady link building techniques. It may sound like a cliche but, you should focus on quality instead of quantity.