Strategy (from Greek στρατηγία stratēgia, "troop leadership; office of general, command, generalship" [1]) is a general plan to achieve one or more long-term or overall goals under conditions of uncertainty. [2]
Whatever you've accomplished in your life, you had a strategy, made up of the goals you chose and the actions you took to achieve those goals. Think about strategy as a path across time. You have to choose a goal, and then a set of actions.