how to counter e4, c5 , Nf3 , Nc6 and then c3
Play some kind of Nge7 Nf5-Ng6 system and castle kingside and play d5 and f5 to attack center, or if you want to be risky play d5 first thing but then white can play Bb5. I suggest playing 1. e6 2. c5 that way you are more flexible
feel free to ask me questions about 3+ im in the 1800-1900 range