What is this opening called? - Chess Stack Exchange

I would like to know what this opening is called, if someone has made a bad move, and who stands better. Finally if this opening is played by grandmasters here.

Why is pawn to c4 opening advantageous? - Chess Stack Exchange

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Should I play different chess openings or stick to 1 opening? - Quora

What is this opening called? - Chess Stack Exchange

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