Q. How can a team keep possession?
A. By giving the player on the ball plenty of options, quick passing and understanding the ball doesn't always have to go forward.
Manchester City are currently the best at this in the country. Every young footballer should be watching this clip of Manchester City players passing it around Manchester United. 44 passes in total leading up to a goal. The high angle shows the movement of the players off the ball as well as the focus on the ball itself. It's a thing of absolute beauty!
Barcelona are a club that have become well known for their pass & move. Here is 4 and half minutes of wonderful, devastatingly brilliant football. Worth watching more than once. The first time you notice the passes, after that, start looking at the movement off the ball combined with scanning.