UY Scuti, the largest star in the universe, has a radius that is 1,700 times larger than our sun's. Such a star is also able to undergo Nuclear Fusion of much denser and heavier objects. In other words, it is able to produce a LOT more energy than our sun.
In addition to that, UY Scuti is also 340,000 times more luminous than our sun. It is still incredibly easy to see despite being many thousands of light years away.
Fun fact, UY Scuti also has a circumference of 4.7 billion miles. To put that in perspective, the sun's circumference is 2.7 million miles.
That is one very big star.
Protons and eletrons start to form a cloud of hydrogen. This cloud has LOADS of mass and are GIGANTIC. Due to gravity, the atoms around it get attracted to the cloud too. But there is a repulsion between atoms which gets them not into each other. These atoms of hydrogen get attracted to each other hardly due to gravity. These atoms start getting crushed. And then nuclear fusion takes place. 4 hydrogen atoms get together to make 1 helium atom(helium was not like you can take it from anywhere, it had to be created through nuclear fusion).
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