Where did Jesus perform his first miracle?

Answer: Cana

Jesus' first miracle was at a wedding in Cana in Galilee.

“On the third day a wedding took place at Cana in Galilee. Jesus’ mother was there, Jesus performed this, the first of His signs, at Cana in Galilee. He thus revealed His glory, and His disciples believed in Him.”— John 2:1, 2:11 (BSB)