Extremely newbie question

[Cyrussm]

hello guys

I used to play RO, and now I'm back, but I'm kind of outdated and rusted,
I have been finding a little bit problem to understand a word (and my first language is not english so is kind of hard) and when you guys say "Caps" or "Capping" what does it actually means?
In a lot of tips I saw that everyone recommends this, is it capturing, or covering? and how do I do that, because you get 10 points.

Thank you