Taking the opponent out of the book right from move one might lead to some exciting games
In one of my recent game with white pieces, I took the game away from the book openings right at the start on the first move itself. This led to a very exciting battle which I won. This type of win gives me a lot of motivation to explore and experiment with different opening moves.
Here is the game annotated by me.
Well prepared openings which are not standard openings will sometimes gives a good advantage.