If white is playing c4 it's going to be some kind of queen's gambit line.
If you're staying in the london, the pawn will go to c3.
Black has many options, of course.
Against low rated players who are playing out of fear of knowing nothing about chess, this works pretty well. I don't know proper theory for it
This is the way I learned first. First 4 moves almost always the same. 5th move almost always Qb6.
No new experiences ??😢
There are so many threads about this opening in the openings section, as well as so much material and so many videos and articles trying to answer your question. If you google site:chess.com/forum "london system" you'll be off to a great start.
Thanks 😊😊
London system usually goes queen side.. no??
Not neccesarily
Kind of
After 9...Rg8, Stockfish gives 10.Ne5