I have to admit, that I never ever clicked on the Resources before, so now as I did, I had the gut feeling you never did either, so I need to share my findings:
So here I listed all 4 of them, and dug deep and brought you all the details I found. Yes, I'm surprised how much more Linkedin tells us about our-self.
What are these tools:
All activity contains All three and the Comments, while the other three contains only the Articles, Posts or Documents you have shared.
I guess your Videos should be here too, but as I don't remember if or when I did post a Video, I can't see that tab here.