I have often seen that players can be confused about the differences between tactics and strategy. So, here is a short summary of the differences.

Strategy is timeless. It is literally immutable. The success of  The Art of War by Sun Tzu - Special Edition is a confirmation that strategies written thousands of years ago are still applicable today to a wide variety of competitive environments. Strategy is there to help you to get to your main objective.

Tactics depend on the environment. Tactics are specifically created to support the main strategy. They are the specific means to get you to the end. Historically, new technologies have always affected tactics.

The right strategy makes tactics work better. On the other hand, if your strategy is wrong from the outset, no matter which clever tactics you use, you are inevitably doomed. Tactics without a good strategy are a waste of resources.