An Analysis of Responsive WordPress Theme

Hello World,
I am very very new to wordpress and coding as a whole, so please bare with me.

My coding knowledge is infantile. Ex. I know how simple coding like <p> for paragraph and
to make a paragraph break.

With these factors in mind, I am looking to acquire some insights on WordPress’s Responsive Theme. Its features include a “Fluid Grid System.” What exactly does this entail? I tried to research this phrase but couldn’t find anything helpful.

Essentially, I am looking for a theme where users should not be scrolling down “below the fold” to get more information, and that is one of the main reasons why I like the WordPress Responsive Theme.

Checklist of my goals for my website:
I am looking to add 3 social media widgets: 1 for facebook, 1 for twitter and 1 for linkedin.

-RSS Feed for a blog, as well as a news feed on the landing page
-Rotating picture panel/widget
-Enough pages to accomodate 8 subtabs (to describe our company’s 8 different programs) as well as 5 total tabs on the navigation bar.

Essentially: I am looking to see if Responsive would be a good theme of choice for these goals.

Sorry if this sounds stupid I am just really really new to website modification as a whole.

Thanks!