Board Thread:Naruto Discussions/@comment-3965545-20170209160500/@comment-3965545-20170210225142

Yup. He can also use Hiden jutsu's and knows the weaknesses of all jutsus.. or something like that.

He has mastered the secret techniques, and genjutsu. So I assume that means he can use them all and knows all their weaknesses too. Hiruzen in his prime was OP, in his childhood he surpassed Tobirama in talent and since childhood was rigorously trained by Hashirama and Tobirama.