1.e4 c6 2.d4 d5 - See Caro-Kann.
3.e5 - Advance Variation. White gains space but the pawn can be attacked.
White's plans: Maintain the pawn chain. Develop pieces and castle.
Black's plans: Attack the pawn chain with ...c5 and ...Nc6. Play ...Bf5 or ...e6.
Watch the moves to understand the opening sequence. Use the controls to replay or auto-play the variation.