Maybe "studying tactics" means memorizing the patterns for delivering a checkmate or gaining advantage/material.
Whenever you see an interesting pattern in your game's analysis, try to understand and memorize it to be able to use it in the future when you have an opportunity to do so.
I analyze my games, watch grandmasters and do lots of puzzles, but I don't know what people mean by "study tactics" or "study chess." I've gotten several books which have provided some answers, but even more questions. How do I learn/progress in an efficient, logical manner?