how to embed ruby code

I am very much a novice learning ruby code right now. I already know
how to write the code and open it in a command prompt. My question is
how do I embed it into an html document? how do I use rails? Im not
sure where to go from here. I've been reading tutorials but havent
found any clear direction. Can someone please steer me in the right
place...

I'd take a look at http://guides.rubyonrails.org/getting_started.html

Fred

railstutorial.org by Michael Hartl is a wonderful resource.