most books are useless if you still blundering pieces left and right. Sounds like you need to still develop your combinational vision. Playing lots of games, and do tactic puzzles. Once you reach a level where your mistakes are not super elementary can you then consider more advanced material .
put in another way, chess improvement is all about improving the quality of your play in critical positions. in master games, it is common for there to be only 3 or 4 of such situations the whole game but as you go down the rating ladder you will find that you will have more critical positions since you are seeing and understanding less. IF you are still blundering pieces left and right, then almost every other move can be a critical position, in which case studying is pound for pound relatively useless. You need to be seeing what you are supposed to see (aka blunders) which means you need to first develop your large pattern recognition base until your blunder alert is second nature. Ideally, you will briefly analyze all your games with or without an engine. tactic books can expedite the process if you do them at the right level. Everything else is minutia till then.
as a drunk idiot that never studied theory or got a coach i think you should play classical chess in your first year and never speed chess.