Shiva and Shakti are not two; they are just inseparable. They are complementary aspect of the same divine being. Understanding them as separate being like a man and woman doesn’t sufficiently explain the idea.
Shiva and Shakti are just like body and soul; identified as two and still are just one. Body is the doer of actions; it executes what the soul desires, it consumes and utilizes the energy. It’s all powerful in presence of the soul. Soul, on the other hand is inert. It Can’t do anything without the body or the energy of the body. Yet it is the soul that makes the body do whatever it wants. Soul without body will fail to do anything; body without soul has nothing to do. Shiva is the soul; its inert and dormant without the soul. Shakti is the body; its the doer of action. The body (Shakti) does what the soul (Shiva) wishes.. Shakti gives expression to the Shiva the way body gives expression to body.
Shiva and Shakti is together like an ocean. Shiva is the still water; shakti the wave. Without water there can be no wave. Without wave it will be just a still water . Together Shakti and Shiva is ocean.
Shiva is the transcendental supreme being; Shakti is the manisfested aspect. They are one. Thats it.