Hello and welcome to the forum! It`s always nice to see some new people posting! I`ll just try give a brief response, I need to go to bed .
Because chess is so big, there is so much information you can devote your chess-time to. It`s so big you might spend a lifetime studying it. Certain things will only improve your skill at the game marginally before you reach a certain level (so in a sense it is a waste of time), certain things you don`t need to study unless you are an IM and some things you should really study from the start. You really don`t want to waste your time!
You want to improve as much as possible with the time you devote to the game. Huge numbers of chess-players spend an immense amount of time studying things that really don`t make them better chess-
players.
The difficult thing is that you can "waste" your time without beeing aware that you are doing so, because you just don`t know what to study.
* So the smartest thing you do when you try to improve is to ask for advice and talk to other chess-players. I would recommend that you check out if there are any chess-club in your area, because just beeing among other chess-players can give you a lot of input. And of course that you hang around here on the forum
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* If you do nothing else; continue with your tactics. That can make you a better chess-player very quickly.
* If you want to spend some more time on chess; make sure that you know how to play the basic endgames well.
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It is my strong belief that the two things above will give you the most "ooomph for the money". You can get to 2000 without spending time on much else.
Just one thing I would warn you against; don`t spend unproportional amounts of time on openings. That really is a big mistake. Increase your
skill at the game first of all, not your book-knowledge.
Continue to have fun with chess and please stay around on the forum!