https://www.investopedia.com/a-simple-technique-to-profit-from-ipos-5078487
"the vast majority of market participants should avoid all IPO exposure, like the plague, because the lack of price points can generate all sorts of dangerous situations."
That said, this article does offer a watch and wait strategy for trading IPOs. "The first price traded in the IPO session becomes immediate support or resistance, often for months or years." The author suggests waiting for the stock to rise up past that first traded price, which usually occurs months (for FB it took a year) after the IPO.
A better strategy is to look for equity carve outs - companies that spin-off part of the company or break up the company into multiple company. There are several studies that show that both the parent and the spin-off do well. I think I have posted about this in the past.