the difference between decent and skilled play?

so, i came here a few days back out of curiosity. i'm not new to the game, i've beaten gaan-telet, i've finished nearly all of the non-vicious unlock stuff, etc, i get the basic strategic necessities like always punch above your weight, i'm okay at this game by this point.
but then i see people posting about stuff like routinely seeking L+3-4 kills at L1 and exploring most of the map before killing any monsters (but somehow still conserving blackspace?) and so on and i'm kind of baffled. is this a "just play the game long enough to get good" sort of thing? are there basic practices and guidelines for high-skill play? are there specific very strong preps/other interactions that bust the game open? (i can't imagine that the latter is the most important thing, judging by some of the streak records i've seen in the dailies)
what defines high-skill play?
but then i see people posting about stuff like routinely seeking L+3-4 kills at L1 and exploring most of the map before killing any monsters (but somehow still conserving blackspace?) and so on and i'm kind of baffled. is this a "just play the game long enough to get good" sort of thing? are there basic practices and guidelines for high-skill play? are there specific very strong preps/other interactions that bust the game open? (i can't imagine that the latter is the most important thing, judging by some of the streak records i've seen in the dailies)
what defines high-skill play?