#2 Grouping midfielders on one side
Guardiola once said that he wishes his team was made up of midfielders. That's how much he thinks of retaining the ball and being the dominant side who can to dictate play. Whenever the opposition play deep, different attacking movements are needed to take place if the team wants to win.
One of them being grouping the talented central midfielders on one side of the pitch, specifically the half-space, in order to free up the centre. To dig deeper, let's look back at an instance from the recent Manchester Derby.
As seen above, De Bruyne and Silva are located on the right side of the pitch initiating an attack. Due to the man-marking duties of Matic and Herrera, they followed City's midfielders to the right side. This lead to central space being vacated and Sterling occupied it immediately yet without optimising it by scoring a goal.
This is an example of a tactic Guardiola used when he was with Barcelona. Iniesta and Xavi had a telepathic connection and knew how to manipulate the opposition.