1.You should use both closed and open questions because they have different pros and cons.Closed questions are quick and easy they get straight to the point.The problem with closed questions is they can sometimes not get enough depth.Open questions are more open to a little freedom unlike closed questions they can have more than one or two right answers and the responses are typically longer.But open questions can easily get off topic.
2.You should use Google search tips to help you get a more narrow or specific search. Like the minus tool to get rid of things that you don't want it or the OR tool which Lets you have more than one thing in your search.The “_” quotation marks help you get an exact search.
