The difference between tactics and strategy is like the difference between design and implementation: it's relative to scope. If your marketing strategy is to provide the best software for older, resource-limited hardware, then writing memory-efficient code is a tactic for implementing that strategy. But if you're hired to make a piece of software run on a particular resource-constrained device, writing memory-efficient code will be part of your strategy for accomplishing that task. The closer something is to being a global consideration in a scope, the more strategic it is in that scope.

If you broaden your scope to your entire life, one part of your life strategy might be to succeed at your job in order to feel pride in your work and economically support support other aspects of your life. In that scope, designing a good marketing strategy would be a tactical consideration in implementing your life strategy.