How to crush "London System" ??

share best games against London system or suggest some sharp lines

Possibly helpful:
Grandmaster Repertoire 11: Beating 1 d4 Sidelines by Boris Avrukh (2012)
https://web.archive.org/web/20140627001415/http://www.chesscafe.com/text/hansen164.pdf
http://www.qualitychess.co.uk/ebooks/GM11-1d4Sidelines-excerpt.pdf
Dealing with d4 Deviations by John Cox (2005)
https://web.archive.org/web/20140627032909/http://www.chesscafe.com/text/hansen89.pdf

Fighting the London System

http://www.chess-stars.com/resources/London_Contents.pdf

Playing 1.d4 d5

https://www.chess.com/blog/pfren/playing-1-d5-d5-a-classical-repertoire

https://www.qualitychess.co.uk/ebooks/Playing1d4d5-excerpt.pdf

A Practical Black Repertoire With d5, c6

http://www.chess-stars.com/resources/contents_black_rep_d5c61.pdf

Thankey !!

d5 is the move

offfo.... I am not so poor to play first move.

I really loved it Thankey so much ... for your efforts

I don't know what the london system is

I enjoy thrashing with the London it can be such an aggressive opening with white... Against it I am not sure. 

1.d4d5 2.Bf4 is known as London System.... It's a rock solid opening, if you are not prepared

1. ... f5 is the best option.for black.

I prefer 1...c5 and symmetrical system

London system usually goes queen side.. no??

London system usually goes queen side.. no??

Yeah... It targets c7

https://www.chess.com/article/view/the-perfect-opening-for-the-lazy-student

Stockfish gives White a +1 advantage, saying Ne5 is strong enough to tie Black in a few knots.

It would be interesting to see how it works in a real game though!

She is not lazy ... 

On which move Ne5 ??