Genetic mutations are random. When they happen they can do nothing (most of the time this is what happens), they can be detrimental (cancer), or they can be beneficial (low cholesterol)
Over times the creatures that accumulate the beneficial random mutations will out compete the others, and it will appear the are “designed” as a solution to their environment. A giraffe needs a long neck to eat leaves, but it didn’t solve that problem by growing a long neck. Random mutations gave some giraffes long necks, those ones could get to more food, and so out competed the other giraffes, so eventually all the giraffes were long necked. The long necks were an outcome, not a design
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