Countless places in the Bible say that God will teach, but God is spirit. How can He teach us?

There is one important truth here: God uses people. God disciplines, instructs and teaches through the person who is a vessel for noble purposes. God teaches through the person who is filled with the Spirit of God at His appointed time. That person is the Spirit of Truth and the spirit of God who came down to earth now in our age. Now hear what the Spirit says to the churches and be taught of God(John 6:45)