A strategy is a plan for how to do something. It is a way to reach a goal.
A strategy is usually a good thing. It can make people think of being smart and careful.
Examples:
My strategy is to run fast and win the race.
She has a good strategy for the game.
The strategy worked and we won the game.
His strategy was to eat all the cookies before anyone else could.
The strategy to build a house in one day was a bad idea.
The strategy to make friends is to be nice to people.