Comparing Population I and Population II stars,the stars that formed first after the initial Big Bang were:

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Population II stars are characterized as the first stars to form after the initial Big Bang, and they are primarily composed of hydrogen and helium with smaller amounts of heavier elements. On the other hand, Population I stars have a higher proportion of heavy elements, which were formed through stellar nucleosynthesis in earlier generations of stars. Therefore, the first stars to form after the Big Bang were virtually all Population II stars, and it wasn't until later generations of stars that Population I stars began to form.

Comparing Population I and Population II Stars,the Stars That Formed