what is the big bang and how do i understand it?

OK I have been trying to get my head around some of these concepts. To start with I wish that they wouldn't use the same term, (singularity), for both a black hole and the BB.On the assumption that string theory is basically correct then wouldn't it make sense that at T=0 all that existed was energy? All the mass that existed would be in the form of energy but there would be no such thing as matter.The initial expansion was so massive I have to assume that there would be an instant event horizon for any place, (if place has any meaning), in the entire universe, and that the event horizon has been shrinking our visible universe ever since. The speed of light isn’t affected by the relative motion of bodies within a galaxy, but it is affected the rate of expansion in the universe. It seems to me then that the theories that suggest time and space are illusionary make the most sense.I keep trying to figure out infinity and spacetime with my 3d and finite brain and I’m not having much luck. It seems to me that in the same way my 3d mind can’t grasp 4d spacetime, my finite mind can’t grasp infinity. As we know 4d space is reality, couldn’t it be just as possible that infinite space is reality. I have no idea how this works mathematically but doesn’t it make sense that the source of energy at the BB would be infinite and as a result our universe would be infinite?If time and space are illusionary or a projection, it must mean the final solution has to be a mathematical one, and that would indicate to me that an infinite solution is perfectly reasonable.I hope this makes a little sense to someone because I’m sure having trouble to to grasp it. Have I just joined the lunatic fringe or is there something to what I’m saying?

Thanks for the reply.One thing you are very right about is the incomplete knowledge. It has to be frustating for people who have studied this for years listen to a guy spout off as if he knows what he's talking about because he's read Brian Greene.The trouble is, it is just so incredibly fascinating. I just sorta stumbled on to this world that I knew nothing about and it turns out its the one I live in. I thought a singularity had zero volume. Plasma sounds like matter to me. I'm probably using the wrong terminology. I'm talking about the part of the universe that we will never see because expansion is expanding it away at a rate greater than the speed of light. I assume that the initial rate of expansion would have created parts of the universe that have never been and never will be accessible to other parts of the universe. Well I'm Christian with a lot of respect for Buddhism. I'm just thinking from a naturalistic point of view. This is a science forum and you'll get me in trouble with admin. I guess I have to but they're slow and expensive.Thanks again. I keep reading and trying to learn but it's like trying to drink out of a fire hose.

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Everybody is entitled to my opinion.