Thank you for asking. I appreciate your looking to learn about community norms and expectations. That seems to me like a reasonable thing to wonder about.
Usually, it's best to leave your question as is, in those situations. We are looking to build up an archive of knowledge that will be useful to others. Often answerers write their answer not just for you, but for others who might have the same problem as well. Thus, deleting your question after it is answered might be perceived by some as impolite or bothersome.
Also: if your question was one that others might have and that others with the same question can find via search, then it's often better to leave your question undeleted, so that others can benefit in the future. Alternatively, if in retrospect you realize your question wasn't such a good one (maybe you realize after you see the answer that you should have done more research or you didn't articulate the problem statement well or it is too narrowly specific to help others in the future or it was too obvious), then normally my advice would be to leave the question as is, and take that as encouragement to step up your game when asking your next question in the future. If you realize that you are asking questions that are too obvious, maybe don't keep doing that in the future, and take that as an opportunity to spend more time trying to solve it on your own, search for relevant material, diagnose the concept you're struggling with, and/or articulate a good problem statement that will be useful to others. We can all improve and do better -- the key is to be willing to learn and adjust, as it sounds like you are open to.