I think the only way to get better at your level is do tactics as much as you can. Forget about anything else, you wont need endgame and openings if you cant see two move mate or win of material. Look at basic motifs/patterns and at some point, when you stop losing pieces and pawns by tactics you can start do anything else.
"The wining chess tactics for juniors" is great book for that or try chesstempo.com
Tactic is basic, is similar to words in language, without them you cant express anything even if you know grammar (theory...). Once you improve your tactical vision you can move to something else. But you need to play as well to use your gained tactical vision in normal positions.
Get idea about opening principles as control center, move just two pawns (not more), develop all your pieces and castle. This is explained in many different articles over the internet. But as beginner forget about memorizing long opening variations you really dont need to know how to play Caro Kann or main line of Sicilian Dragon.
If you really want to improve your game stop playing bullet, even rapid can hurts your chess. Try to play few slow/standard games (more than 1hour per side). In this type of game you can learn how to plan, how to calculate and understand position. Be careful about blitz play, too much is not good either, but in blitz you can train tactics and try new openings.
Try chesstempo to get idea how good or bad you are at tactics.
Once you are 1500 standard chesstempo you might look at basic openings (just few moves) and endgames. Once you are over 1800 you can start to think about plans and positional strategy.
I hope that it helped you.
Chess is a game so mainly enjoy it.
btw:
I started play chess a year ago and since then I did over 5000 tactical puzzels.
I'm taking up chess as an adult and have all the usual problems like overlooking tactics and mates, which I'm slowly overcoming. Because I have no intention to stop playing any time soon I'm keen to learn in whatever way brings the best results long term, even if it means slow progress. I've read differing opinions about priorities - contrary to the tactics tactics tactics advice quite a few pros suggest that people who become really good players start with very simple learning e.g. a couple of pieces on the board, and build complexity gradually (e.g. the Russian schools, Bruce Pandolfini, Rashid Ziatdinov, Josh Waitzkin). The idea is to engrain simple things so each layer of complexity sinks in properly, as opposed to racing ahead with openings/tactics for quick gains and plateauing later on. This is what GM Ziatdinov said on Silman's website:
"For training, you need to set up on a board the simple positions ..... and, without moving the pieces, “fly” around all the main lines and sideline variations everyday. There will come a time when you will feel “how fast your brain is.” You must fix this feeling in your head. This state of mind in which calculations seem to fly is real chess concentration. You should understand what it means to think fast, so fast that you do not follow your own thoughts, so fast your calculations are virtually subconscious. All strong players achieved this level of concentration when they were only 5-7 years old. As adults, they cannot comprehend how untrained players do not see lines and combinations immediately. For them, chess calculation is so fast they are not even aware of the process."
Any views on this? Would it be better to focus on basic endgame positions, then tactics etc later in order to have a better feel for the game. I'm not saying being what he calls a "strong" player is necessarily realistic for adult learners, but do we miss an important stage of learning that people who learned the game as kids went through if we spend most of our time doing tactics puzzles? Thanks...