Do you mean actual academic knowledge or general social knowledge that seems to be instinctive in other people?

If it's the first, no a therapist won't help. But if it's social knowledge you're seeking, then yes. In my opinion, group therapy, would be most helpful because you have the interactions between yourself and the other members to learn from. Observation and human interaction are powerful tools. Individual therapy could help too but I think it depends on the approach of the T and the specific things you want to learn.