“Tactics is knowing what to do when there is something to do; strategy is knowing what to do when there is nothing to do.”
— Savielly Tartakower
So true, and not just in chess. Small picture and big picture. Translated: Tactics is about identifying opportunity and exploiting it; strategy is about creating opportunity for exploitation. Without tactical sensibilities, strategy is purposeless; without strategy, tactical opportunities are left to luck and coincidence.
Tactics and strategy. Get good at both.