Oh this is such a common beginner mistake. Opening study is so seductive; it seems an easy shortcut to chess proficiency. The problem is that your opponents will almost never play what you are expecting and hours of study that could have been spent analyzing games or studying tactics will have been wasted. Others will undoubtedly disagree...
Of course I wrote the above without realizing that your 1200 was a "real" rating as chess.com gives new members the option to start there. So my bad for being lazy. Still, many experts say wait until you are 1500 or even 1800 before studying openings. Shame you aren't a diamond member as there are a ton of opening resources in the videos and mastery lessons. Well, there is always youtube of course and some of the presenters do a very credible job. One thing you can do now is use the Explorer to see how the pros usually play and of course review your games.
So I am fairly new to chess but I love it and want to get better. One of the areas I struggle in (which are all of them to an extent) is opening theory. I watch a lot of chess streams, and I hear them talk about various lines and variations of openings. Where should I go to study lines of various openings in depth?