Html/css or C#/unity game engine?

So I'm a VERY beginner coder. And by that I mean I've gotten 2 lessons done on tree house. One on codecademy and that's about it. My question is a bit unusual but understand I'm not sure much of anything. So through team treehouse I've been learning html/css. I'd like to think I have some knowledge of the basics but not entirely yet. My goal as a programmer is to eventually work with games. Or just to be able to create a game through an indie team. I was recommended by a cousin who works for naughtydog to switch what I'm learning and just start learning C# and unity game engine. But I'm just now getting the hang of html/css. I know part of me really found making websites really interesting and thought I could make a part time as a web developer. And on the other half maybe independently makes some games. But I'm just not sure which is the better of the two to start with. On one hand I do what I want to do and not sure of a financial outcome, on the other I learn the language I started with and possibly get myself started on a small career. Is it smart to try and learn both simultaneously? This is my first language Choice after all.