I have found that it's not what you want to ask or know it is more what the cards want to tell you.
For sure if I ask a question my cards will give me an answer but when they really want me to know to something they send up a big red flag and they will keep on repeating it over and over until I get it.
I keep a journal/log book of my questions and the answers I get. Only yesterday I sat in the garden going through that book and ticking things off. It was all very clear and obvious, the question became a secondary issue, it was the reply in the tarot that became the driving force.
This has been my experience too, so my reading style is to look for the "message" the tarot has for me. & That being the case, my approach is to simply let the cards tell me what I (or someone else) need(s) to know, as opposed to asking questions.
Or rather should I say, I generally BEGIN by letting the cards show me whats up, and then I might delve deeper by doing another reading in order to explore some aspect further. So sometimes I will follow-up by asking a specific question about something that presented itself in the original throw. Or I may do a series of readings (asking various questions), based on the message the tarot revealed to me.
So all in all, my go-to question is: what do I need to know? Then I might follow this up by asking more specifically "about" something the tarot brought to my attention.
& As far as reading the cards drawn, I generally throw from 3-5, and then look to see what issue or situation the cards are depicting & where it's coming from, in the sense that i'm trying to gage why it's happening (or likely to happen), or why it's of importance.
& I also consider ALL the cards thrown in terms of advice. & By viewing the cards this way, they will either shed light on how to best handle the situation the cards are depicting, or the ADVICE in the cards is the
message the tarot has for you. & When this later occurs, you will generally know "what" the advice pertains to.
& I also look at ALL the cards in terms of a "chain reaction", in the sense that I also check to see if they could be telling me where things are headed? Not to mention, that it's helpful to view them in terms of possible cause & effect.
So all in all, I prefer "open readings" where the tarot dictates the content. & I've found the secret to success is to wrap my head around the message that is being revealed. So i tend to view the ? as of little importance, when reading this way.
Tho having said that, a well worded question is necessary when your reading about something specific by using a spread with positional meanings. Not to mention, but its also important to use the right spread, and otherwise match the spread to your question, by choosing one that has positional meanings that can be used to answer your question.