Hi atawal and welcome to HubPages
Briefly, HubPages is a place for writers to have their articles (hubs) published, while at the same time it is also a place to enjoy reading the hubs of other members. Once can also earn a little extra income if one writes interesting articles and gets a lot of traffic to your articles - one needs to join Adsense, or Amazon etc first though, then add one's publisher id or affiliate link into one's account.
Spend some time reading through everything on HubPages, and you'll soon be enjoying it like the rest of us!
The "about us" page link can be found at the bottom of HubPages, and, once there, look down the left to find a grey block of text, describing HubPages in a bit more detail, then browse around HubPages to find out some more. It is useful to first go through everything on the site to enable one to "get the hang of it" more quickly.