Screenshot of The Macmillan Dictionary website showing results of a search for the word strategy. The results shown are:
A definition of the word as a countable noun:
[COUNTABLE] a plan or method for achieving something, especially overa long period of time
successful language-learning strategies
The countries hope to devise a common strategy to provide aid.
A definition of the word as an uncountable noun:
[UNCOUNTABLE] the skill of planning how to achieve something,especially in war or business
experts in military strategy