This is very famous HR interview question and idea behind asking this question is that they want to know your strengths. it's indirect way to ask your strength like "what are your strength". so you should tell your strengths like i am good at this and that (your technical strengths like any subjects,communication skills, fast learner etc.).
so finally you need to tell your strengths but do not say that i am the best and you should hire me and yes do not mention so many strengths even if you have.only tell few of them at which you are strong.
so finally you need to tell your strengths but do not say that i am the best and you should hire me and yes do not mention so many strengths even if you have.only tell few of them at which you are strong.