NLH has basic strategy concepts you must learn for Table Position, Hand Selection, and Betting Actions.
Watch 'The Triple Threat' video from Evan Jarvis of 'Gripsed Poker Strategy' to further understand the basic strategy concepts of position, selection, betting (aggression).
Watch 'Inquisitive Poker' video from Phil Gordon to become an inquisitive (unpredictable, game feel, aggressive, intuitive, improving) poker player vs. being a prescriptive (predictable, formulaic, tight, nitty, unimproved) poker player. What questions should I be asking myself? Poker Player's Scientific Method.
Poker Player's Scientific Method During A Hand
Watch 'Poker Strategy' video with Daniel Negreanu on the Switch4Good podcast. Daniel breaks down his approach to poker and gives a quick rundown of many of the different poker fundamentals he focuses on.