What's this black knob near the oil pan under my car (2007 Hyundai Santa Fe AWD)?
Oil seems to be leaking from or near it (black liquid, I assume it's oil), trying to troubleshoot first leak.
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If your engine is the 2.7 litre, then that is the oil filter.
You can see this in this video detailing how to do an oil change on the 2.7 litre engine.
The oil filter may just need tightening a little, or probably best replace the filter. The filter shouldn't be overtightened however. Best to read the instructions on correct tightening, like in this example video.
Best to get this attended to soon, since the oil filter may be working loose. If it does unscrew, it will cause a very quick dump of all of your oil which would be catastrophic for your engine.