I was overwhelmed by the amount of information on <https://dev.twitter.com/docs> and then I went to twitter4j and downloaded the library. I got a consumer key and secret by registering on their website. What are these for?

What I am trying to is get tweet text from certain twitter account( not my personal one but public one) and other information( account user, time and other stuff).

I couldn't find useful tutorial online. So please help me. Thank you very much!