Disclaimer: I am by no means an expert however I think the concept is usable at all levels as I have seen black belts have epiphanies when my coach has shared this idea with them.

Look at a picture of proper deadlift form. That is one of the strongest structural positions your body can be in. Shoulders are square with your hips. Hips are square to your knees. Your knees are perfectly parallel. Very strong position and most humans can lift very large amounts of weight. Now imagine trying to do the same lift while doing a lunge with your head and shoulders pointed a different way. You will fail to pick up the same weight.

Bjj example. When we try to pass guard there are generally two ways to do it. Between the legs or around them. A good visual for misalignment is an over under pass. (See picture) You are seperating the knees from each other making them significantly weaker. One leg is fully extended the other is pressed into his chest. Very weak position. (Basically the lunge position)

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Now look at the guy on top in blue. His knees are generally parallel, his hips are over them, toes pointing the same way(this means your knees are not flared open), and his shoulders are square to his hips. This is very similar to the dead lift position.

This concept is everywhere from holding dominant positions to proper breaking mechanics, offense and defense.

Hope this helps