After this Jesus revealed himself again to the disciples by the Sea of Tiberias, and he revealed himself in this way. Simon Peter, Thomas (called the Twin), Nathanael of Cana in Galilee, the sons of Zebedee, and two others of his disciples were together. Simon Peter said to them, “I am going fishing.” They said to him, “We will go with you.” They went out and got into the boat, but that night they caught nothing.
Just as day was breaking, Jesus stood on the shore; yet the disciples did not know that it was Jesus. Jesus said to them, “Children, do you have any fish?” They answered him, “No.” He said to them, “Cast the net on the right side of the boat, and you will find some.” So they cast it, and now they were not able to haul it in, because of the quantity of fish. That disciple whom Jesus loved therefore said to Peter, “It is the Lord!” When Simon Peter heard that it was the Lord, he put on his outer garment, for he was stripped for work, and threw himself into the sea. The other disciples came in the boat, dragging the net full of fish, for they were not far from the land, but about a hundred yards off.
When they got out on land, they saw a charcoal fire in place, with fish laid out on it, and bread. Jesus said to them, “Bring some of the fish that you have just caught.” So Simon Peter went aboard and hauled the net ashore, full of large fish, 153 of them. And although there were so many, the net was not torn. Jesus said to them, “Come and have breakfast.” Now none of the disciples dared ask him, “Who are you?” They knew it was the Lord. Jesus came and took the bread and gave it to them, and so with the fish. This was now the third time that Jesus was revealed to the disciples after he was raised from the dead.The Holy Bible: English Standard Version. (2016). (Jn 21:1–14). Wheaton, IL: Crossway Bibles. Emphasis added.
What is this story about? Fishing? The disciples going back to a way of life they knew before Christ? Peter not feeling confident enough to walk on water this time and swimming 100 yards instead?
I don't think so. Note those words I put in bold above. The emphasis in this story is Jesus revealing himself.
So here's the tool tip of the day: When you're reading your Bible and trying to understand a story, look to see if you can find those sort of framing words or concepts. Usually if you can get that big picture in place, the details will start to make more sense and point you in one direction, rather than pulling you off down various rabbit holes.