Guru is a planet for Wisdom, Devotion, Justice, Honest, Religious interest.
If Guru in first house Native will gets wisdom. He will be honoured by all . He is a honest person and following Rules strictly. He will have good Academic career. He will gets intellectual kids. He will makes pilgrimage to all places. His memory power will be unimaginable. Native can guide all people to success.
Bad thing is native will faces some troubles coz of his honest. He will be targeted by corrupt people but native can win his battle.