What Is the Most Common Thing in the Universe?

Hydrogen is the most common thing out there in the universe. So if you're imagining this cloud that formed the solar system, it's mostly hydrogen with like a sprinkle of other stuff,. Like the iron and the magnesium, all that stuff is like the spice on top of the meal. The sun today is like 95% hydrogen, but the earth is much less. And I guess where did the rocks in the rocky planets come from? They came from the hearts of other stars, right? Those rocks are made of heavier elements.