I did some searching and there is Very little in specifics, otehr then Devines book (which i don t read)
but here is the basics - im sure there is more and it needs to be fleshed out .I imagine Congressional hearings would do that
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The laptop details Hunter’s involvement with a Ukrainian natural-gas producer that paid him millions of dollars to serve on its board — the relationship at the center of
Donald Trump’s first impeachment. It shows how a Chinese energy company directed millions of dollars in consulting fees to Hunter and his uncle. It reveals White House meetings and slush-fund dinners and wheeling and dealing, from Romania to Monte Carlo to Cafe Milano. Most important,
these people claim the laptop contains proof that, despite his denials, Joe Biden — allegedly referred to in emails as “the big guy” — was fully aware of, and looking to profit from, his son’s business activities.