Stars come about when vast clouds of hydrogen, helium, and dust contract and collapse due to gravity.

That's a good question that is still being asked by astronomers, but the short answer is that stars coalesce from clouds of dust and interstellar plasma that collapse under their own gravity, until the interior becomes hot enough to sustain nuclear fusion. The clouds of interstellar plasma come from the Big Bang, but the dust comes from the supernovae of other stars. How did the first stars form before there was any dust? Nobody knows.