Sunni Books Of Hadiths And Shia Books Of Hadiths
Well according to me he should study all hadith books and accept only authentic narrations which have chain to the prophet. But as we know in shia hadith work on chain of narration is weak that they do not even reach to prophet. So me must check that
No we cant say that because it also contains weak narrations, and we must try to understand the contex how when and for what prophet pbuh said something. you can read introduction of sahih Muslim
Its better if you could post this question in Hadith thread: Discussion 1042