See someone hasn’t rushed back to explain the mass 5 and 8 gap problem and the person that blurted stars? is that an answer or a question.
It was the answer - the simple version.
Big Bang nucleosynthesis is responsible for the formation of hydrogen and helium according to the Alpher-Bethe-Gamow theory and stellar nucleosynthesis is reponsible for the heavier higher elements according to Bethe's later theories.
Your confusion regards the other posts you have made follow from your misunderstanding of space-time curvature (non Euclidean geometry of the universe), the effect of relativity, gravity and assumptions such as some galaxies not travelling relative to us at light speed. Will really throw you to find out that the edge of the observable universe in any direction is about 46.5 billion light-years away! And this is easily explainable to a clever person but to semi-quote you - I'd hate to dumb you down.