Well explained.
Evolution only works because the transfer of the blueprint (the DNA) is copied very precisely, but occasionally small random deviations (errors?) occur.
Usually the DNA modification is harmful. As a result, the new creature cannot survive and the harmful copy is erased. Tragic, but inevitable.
In very few cases the blueprint change is useful, then it will be passed on to the next generation and will eventually prevail.
Now all it takes is eons of time. And that is available to life.
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Also, as the environment changes, epigenetics kicks in, turning on some genes and others off..
It's like putting a million monkeys on typewriters and waiting for a Shakespear play.
With enough time and variance, amazing things happen!