We get a lot of questions which, I expect unintentionally, turn out to be yes-or-no questions. This may occasionally be entirely the best way to ask a specific question, but often a question can be slightly re-worded, to encourage much higher quality, in-depth answers.
A couple examples, based on patterns, but not necessarily specific questions, I've seen on the main site:
Yes-or-No: Is reading children's books helpful in learning a language?
Improved: How can I best use children's books to learn a language?
Yes-or-No: Should I use flash cards to practice vocabulary?
Improved: How can I begin incorporating flash cards into my study to improve vocabulary?
Yes-or-No: Can a crash-course help me learn a language?
Improved: When should I consider a crash-course to learn a language?
Note that these re-worded questions do start to stray toward the "subjective" end of the spectrum, so some care may need to be taken to stay within the "good subjective" range.