First, I want to be clear that this tutorial is about how to post a slideshow of pictures, not a slider which has text or content included. However, a slideshow can show captions. An example is shown below. If that's what you are interested in, please read on.
The second thing I should mention is that Beaver Builder is a paid plugin. You can find a free version, but the slideshow is not one of the modules available in the free version. For this example, I will be using the paid Standard version.
Also, the pictures that I have used in my slideshow are free images from Pexels.com.