What’s it like courting a fae? How do you know they’re interested? I know they have a different set of rules than us so do you have to follow them as well? I’m genuinely interested :)
So, for starters, all fae are different! Cornish fae might be different than Scottish fae, and so on and so forth. I tend to use fae as more of a catch-all term, but I've recently been told that fae are land-linked to the UK -- or at least there are land-specific fae that need to be accessed there rather than through diasporic means.
Regardless, the whole court system and Seelie/Unseelie is (IMO) highly debatable and isn't the Standard everyone thinks it is. Seelie/Unseelie were terms applied to fae by the (Christian) Church in the UK, namely Scotland, because the Church saw that their converted and devout members still wouldn't let go in their beliefs about the Good Neighbors, so the Church decided to make them more angel/devil-like in order to help moralize and teach.
Now, what I've been taught from Fairge (UPG), is that although the Seelie/Unseelie court system wasn't the original norm -- in fact, Scottish fae had divisions based on seasons, but not light vs dark -- it's become real through belief. This is not the way it happened, but imagine that fae fractured off into their own freehold and the belief of humans that Seelie/Unseelie divisions existed shaped how the freehold existed.
It's kind of the same concept about how humans shape the gods through belief.
I have a very Terry Pratchett's Discworld concept of paganism, in that I think belief makes deities and/or spirits. No belief = a weak or unseen/unheard deity. Lots of belief = a popular, or well-known deity who is seen to have a lot of power. Belief shifts who the deities or spirits are.
So, some fae abide by the Seelie/Unseelie rules. Some very much don't. My general advice is to treat all fae as if the rules apply -- such as names being stolen or not making promises / owing them -- and you can even tell the fae you're dealing with that this is how you're going to act moving forward. When you've developed a proper relationship and you know more about them, then you can be more lax.
A point of advice I like to give to people is to have an "astral" name. So, I'm Rook online, I have an IRL name, but in the astral I use, let's say, Grey. Anyone I talk to over there is given the name Grey. It gives me protection that they don't have my 'real' name, either of them, as well as giving me a means to trace back information. If something shows up in divination or other sources citing the name Grey, I know that they're from the astral / otherworld.
As for dating fae -- I've found they're very human, in a lot of ways, but also very inhuman in many. You should expect misunderstandings and disagreements. The initial courting was mostly the same as I would expect anyone's to be. The getting-to-know you and the interest being conveyed either through divination or astral encounters.
You should also expect that... things they want are more symbolic than literal. This is an extreme example, but let's say they demand your love, your heart -- and you're willing to give it to them, the feeling is mutual. You may end up astrally giving them your heart, the organ. It's not necessarily you assigning them physical power over the organ; it's symbolic.
Of course, this kind of casual body horror is stuff I'm comfortable with but others very much aren't. Your experience may vary. I'm very uncomfortable giving literal words of romantic intent, so it's possible we worked around that with this kind of symbolism.
I know @saltwatersovereign might have advice on this topic too.