Since you are a Gold member on the site, I would highly recommend looking at doing lessons related to the idea you are curious about (tactics, strategies, endgames, etc.)
For clarification about the difference between tactics and strategies: Tactics are immediate, best moves that you can make; a common term for these is also "puzzles". Strategy is playing good moves which provide long-term benefits to the position. If you play good strategic moves over the course of the game, then tactics will naturally unfold and become available.
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So I have now learned a few openings. Or, I wouldn't say I have learned them since they are obviously much more complex than I have the ability to understand at my current level. Nonetheless, I find myself knowing what to play the first 4-5 moves in most of my games. I play the Vienna game, often the Vienna gambit, sometimes the London system, and then I play the french defense if white starts 1. e4, and the kings Indian at anything else.
Now there is nothing more I would rather do than just sit and fiddle with openings all day, but I have heard that if you really want to get better at chess, you got to study tactics, strategies, and endgames. How do you go about that? And what even is the difference between tactics and strategies? And... study endgames? You mean like first I have to learn what to as King and pawn vs king, then I have to learn what to do against King and pawn vs king and knight, and so on? My rating has grown with around 200 points the last month, and I would very much like it to continue the same way.
Thank you in advance