What's the idea of typical b4 in London System?

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noobpawn99

I don't know why Engine says this is best move...

Can anyone explain to me?

AtaChess68

I am not an expert at all but blacks queen side looks weak and they are not ready to castle kingside.

AtaChess68

And were is the horsy going if you push that pawn even one step further to b5. And then even b6 looks nice...