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Not that I have any experience, but I would guess it's mostly in the skill of negotiating the curves with minimal loss of speed, while not crashing.

Control the sled to steer it along a "racing line" that will net you the best time.

More difficult than it looks, especially when you're hurtling down the track, one slight miss of the line and you'll see hundredths of a second shaved off your run, which will cost you

See the top 10 womens singles results from Sochi in 2014, the top 10 spots are within 2.9s.

[1] https://www.olympic.org/sochi-2014/luge/singles-women

Start on the track, without creating... And do it quickly. The start is important, and taking the turns cleanly. Despite the fact that she is just laying the, it is harder than it looks

They touch on these key skills in the video. Apparently mental focus is a lot of it as well.