"How this universe become exist? Why it exsist and how it become look like it's condition now?"
Our universe exsist since around 5 million years ago. It is believe that our universe formed from a big bang. This big bang cause the formation of energy, matters, and time. All of the matters are thrown away to everywhere at an extreme speed and automatically cause the exsistence of universe.
In the theory, Big bang started with an explosion that comes from matters with infinite dense and zero volume. After the explosion, All of the matters were scattered to all direction. This Big Bang Theory is the most well known theory that's known now. It is because this theory had been proofed. First of all, based on research, we know that all sapce things in this universe are moving away each other. This fact shows that this universe are not static, but always dinamic. This fact was known from the radiation that scattered by stars and the other things in this universe. It is said that if the radiation is red colored, it means the things are moving closer to our planet. Oppositely, it is said that the things are moving farther if they emit purple colored radiation. It is known that almost all of the space things are emit purple colored radiation. That automatically proof that the space things are moving farther each other.
Beside that, the strongest evidence of Big Bang theory is echo of big bang which still exsist until now. This echo trance is detected everywhere in this universe. Thus echo trance, which called cosmic microwave background radiation was founded by Arno Penzias and Robert Wilson as the evidence of big bang theory.
There're also another evidence that proof the big bang theory. Based on the calculation of Hydrogen and Helium in this universe, it is show that the comparison of those two elements are always in balance amount. The hydrogen will vanished and not exsist more in this universe due to fuse reaction that transform them into helium if the universe always constant.
Big bang theory are approved by most people right now. It is also means that most of people agree that this universe exist from nothingness at it's start and become exsist by an explosion called Big Bang.