Kwtd is fine. Not everyone has time (or wants) to be accommodating towards inexperienced players, and inexperienced players aren't entitled to being taught.
Both of which are fine.
You can always watch a video, and message the host telling them you've seen videos but since you've never done it, you're going to need some help. If they say no, or just ignore you, move on and try someone else.
Or just make a post yourself saying that you need to be taught.
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Asking for kwtd is fine. Asking for kwtd while contest mode is on is basically looking for a carry.
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Not necessarily, contest is pretty fatiguing and having to full out teach another player would be frustrating if you're already exhausted. It's one thing to spend a few wipes on getting strategies aligned with new players, it's another to have to wait for a player to get acclimated to the new encounter. I didn't dump as much time into contest as others, but when I got my clear, some of the guys we'd LFGd into our group said they'd been at it for 36 hours straight, no way would they have wanted to waste an ounce of time