What makes a great first sentence?
You must be shameless and your first sentence must be irresistible. It must induce curiosity and promise the answer to an urgent question. You must do whatever you can to lure your reader into the web you've woven by writing a sentence so provocative and so powerful that s/he is compelled to continue.
What makes a good hook in writing?
The key to writing an effective hook in the form of a question lies with considering what you can ask that will make readers want to learn more. It can be helpful to relate your topic to surprising statistics, current events or other subject matter that your audience members are likely to feel strongly about.