Feed Back Please

Hi,
I’m wanting a website which needs to be involved with a CMS so I thought of using Word Press. Does it have a certain way for one user to edit a certain page. For example there are home, news, about and contact pages. And I want to give one user to only edit the news page (not other pages).

Another thing for the website is it needs a members login so members can view hidden pages (pages that non member can’t see). The member’s login would involve a forum.

Is word press reliable to do this??