You should use both closed and open questions because they can provide you with different answers depending on what type of question you choose to use.If you would like a more detailed question then you should use an open question. If you are looking for more of a one word answer you should use a closed question
Using Google search tips is helpful because it provides you with a more direct answer and the search is limited to what you tell it to search.
For example if you put a word in quotations you are telling google to consider that exact statement, this will narrow your search to help find what you need. Also if you put a minus sign in front of any word it will exclude this word from your search, this will also help because if you are searching something and it is a broad category you can use this and it will exclude this word from your search.
