Can't understand how does some User Points rules works

Hello. I need help to understand how does some user points rules works.

First one is:

Like posts
Earn points when someone likes your posts.

What is post? Its a "Story" or "any stream item"?
If I added video:
1) user reacted to my stream item with video => will I get points?
2) user reacted to my video (in sinle video layout) => will I get points?

Thanks.