That is one reason. He came to teach who He was and what He was about. Saving folks from their sin is part of what He is about. It's important for folks to know Him, what His promise is, and what one must do in order to be saved. His teachings included about Him and His Spirit, so that others could know the reference for judgment.
That was the main reason. To be saved, one does need to understand Him. But, He has also only given us knowledge about him up to a point. John said if he had written everything there is to know about Christ it would fill many more volumes. (paraphrasing there).
Jesus came that we might have life. That is the reason. To have life, you have to know who He is and accept His gift of salvation.
Once that would be accomplished, he did give His church further instruction for how life operates and how the Godhood operates. But the reason He came was for our salvation. The reason He has interacted with man at all is to reconcile us to Himself. Starting in the Old Testament, the sacrificial system, the law, the whole thing is showing us that we are sinners in need of a Savior and Christ came to be our Savior. Only one that could have done it.
Romans 9 speaks of how God basically puts up with the evil in the world in order to show us His mercy - so in that regard, yes, we are learning about God and "what He's all about." We could never have understood what Good is if we hasn't witnessed evil. We never would have know the richness of His grace unless we had seen and experienced it ourselves.