。
The point is, you didn't learn anything from him.
Literal
The-point [topic-は] you [subject-が] he from nothing [object-を] didn't-learn [thing-こと] is-[である].
何も + negative = 'nothing at all' — the universal-negation pronoun pattern. 習う specifically means 'learn through instruction,' contrasting with 勉強する ('study') and 学ぶ ('learn / be educated'). から marks the source of instruction. である is the formal copula closing the 要は frame.