After Jesus’ rising from the tomb, he appeared many times to his followers, giving many proofs of his resurrection. In John 21, we see one particularly significant appearance to seven disciples at the sea of Galilee.
He shows up when they were not expecting him.
He reminds them of who they are, and whose they are.
Jesus doesn’t give them an “assignment”. He gives them himself. And he demonstrates the truth that apart from Him, they – and we – can do nothing.