how to play if black plays f6

i kinda struggle if black plays an early pawn to f6, can someone help me counter it?

Can you give an concrete example?

A 2k rating guy told me to simply play Bh3 and continue the london from there

The opponent maybe trying to play dutch so learn to play against dutch with london

This is how I've started fighting against the London system. So far I remember I used it in my last two games against the London and I had better eval at some point from the opening in both, but I'm still not experienced with it. I learned it from "Want To Crush The London System?" on gothamchess channel on youtube.