I stepped on my macbook, and the screen cracked but the actual picture on my computer laptop wasn’t effected. I know the type of screen is LCD, but I can only see a thin line where the crack is. Everything else is fine. Do I have to replace the whole screen in order to get this fixed?

What kind of computer/laptop is needed to play WOW successfully?? I dont know what all the numbers and letters mean. Im very lost and seek wisdom from people that know what they are looking at.
I want to learn, i just need someone to teach me.