Big Block vs Big Gird

I am getting started to use Newspaper theme and need to understand the difference between Big block & big grid which are added via visual composer ? Also, can you please point me a tutorial on how to set these up?

I have gone through the documentation at https://forum.tagdiv.com/newspaper-theme-documentation/ and looked at the youtube channel but still a lot is missing.

I am looking for a simple guide which explains the difference between these two and tells us how to set them up?

Thanks