This is probably the most popular question that everyone has it in their mind and the fact is that no one really knows the answers except me. :D I'm just kidding but you can evaluate my answers whether it makes sense to you and I hope you will agree with my answer too whether our universe has the beginning. So, her you go my answer:
As I mentioned in my previous post that everything is in progress or moving in this world, so in order to prove that our universe has a beginning, we must prove that at least "SOMETHING" is "STATIC". The sad news is we're unable to prove that because every static objects eventually will be be proven wrong (which is in fact moving).
The PERSPECTIVE is a key. It really depends on which perspective you're looking at. We have seen many objects are not moving or in STATIC but if we look from another perspective, those objects are moving in reality. However, have you seen any "Moving" objects are in fact "Static" from a different perspective? The answer is clearly no. Even if the answer is yes, then you're probably looking at the perspective that similar to the "Moving" object (e.g. you're moving as the same direction and same speed with the object). This is not true because the static is only true with relative to you but not somebody else.
No matter how hard we try to prove anything that is static, it will always be proven wrong when we look at it from a higher perspective. Therefore we can conclude that if we ever can prove this universe is "STATIC" and has the beginning, it will be always proven wrong if you look at it from a higher perspective. So based on this argument, I will say ultimately our universe has no beginning and everything is in progress. This also means that our universe has NO ENDING too.
Does this make sense to you?