Board Thread:Theories and Speculation/@comment-35685868-20180605140514/@comment-6769189-20180613225533

It depends on which databook you want to believe. One he says he knows how to use all the jutsu in Konoha but another one says he has only studied them.

If he does know it, he probably isnt very good at it. Part of the reason FTG was so dangerous/effective in the hands of Minato/Tobirama was because they were so fast. Hiruzens fighting style also heavily relied on using his staff thingy and at the time he fought Orochimaru it was feeling heavy for him.