This verse lists the places from which people came to follow Jesus.
Discipleship means being prepared to follow Jesus even to the point of death.
Mark says many people are now following Jesus, more than the four disciples he has already listed.
To follow Jesus as his disciples means that we too face opposition to living like him.
As to your comments about selling all that you have to follow Jesus.
The first one was to be about the apostles being called to follow Jesus.
He tells all in the house of what he has learned while following Jesus.
But the way to peace lies in truly following Jesus.
(27) Peter says that they have given up everything to follow Jesus.
We remember that the church is not a building, but a family, a body of redeemed men and women who follow Jesus.