This identification and absorption of key concepts is part of any serious training program, in both tactical and strategic terms. It's much more difficult, or even sometimes impossible in practical terms, to calculate a tactical win if you don't have an idea of what the final position should look like, for example a particular mating pattern. Similarly, failure to recognize key strategic or positional factors can lead to missed opportunities or being effectively dominated by an opponent who is able to capitalize on them.
Future posts along these lines will be documented here for reference, under two categories:
Instances of what not to do and why, as illustrated by mistaken concepts at the amateur level. The Amateur's Mind by IM Jeremy Silman has a book-length and systematic approach to covering some of the most common issues and is part of my library. A more recent treatise on the topic, more from the professional's point of view than the amateur's, is Grandmaster versus Amateur (Quality Chess, 2011) edited by Jacob Aagard and John Shaw. Based on reviews (included the linked one above) it seems to offer useful insights, although I don't yet have it myself (perhaps in part because of the silly cover). A classic example of the genre is Max Euwe's Chess Master vs. Chess Amateur, which would be a great candidate for an updated "21st century edition".
I periodically run across clear, fascinating examples from master play that cause a lightbulb to turn on inside my head. These concepts are worth documenting for my own use in training and in general should be known by any strong player.