VOO, VTI, VFIAX. All basically the same thing. You can't look at an overlaid graph of them and tell them apart. They own basically the same stocks, earn the same amount, charge the same fees, etc. VTI is theoretically slightly more diverse, but the amount of small stocks in it is so miniscule that there is no real benefit to it. Buy any of those and you'll have a great start to investing.
VLXVX would be also worthy of consideration. It is a set it and forget it fund. Good for starting out.
But ultimately, when you are just starting investments, the fund you choose has almost no impact. What matters is how much you invest and how soon you invest it. Once you have a sizable chunk, then consider where to invest it. When you are just starting out, choosing a "bad" fund that pays 2% less is nothing if you only have say $1000 invested. That is a loss of only $20. But being paralyzed trying to choose just the right fund and not investing soon enough could cost you many tens of thousands/hundreds of thousands of dollars over your life.
More important questions before we can really answer any more details: What type of account? What is the purpose of the investment?