Castle quickly

It is important to castle early in the game to move your King to a safe position.
Observations on the position:
- Material is equal
- Black has not castled and his King is near the centre
- White's pieces are better developed

White won as below:
1. Rf1-e1+ Bc8-e6
2. Re1xe6+!! f7xe6
3. Bc2xg6#
1-0