Borussia Dortmund was a very impressive team that played at a high pace, had a nice style and flexibility, which Jurgen Klopp led to two German championships, a cup, and a Champions League final in 2013.
Borussia was a very attacking team as during the match many of its players moved in front of the ball with one full-back always participating in the attack. The main key points during the attack were the creation and exploitation of empty space, quick combination (simple and complex) play in the attacking third, and finally the rapid positive transitions.
During the attacking phase, Borussia under Klopp's guidance, attempted to control the pace not only through maintaining possession but also through rapid negative transition, an element that allowed them to immediately regain possession.

Athanasios Terzis provides a complete and extensive analysis of Borussia Dortmund under Jurgen Klopp's guidance, which includes diagrams and detailed explanations.
The analysis was used to create 16 complete training units (75 exercises) that contain functional exercises, game patterns, possession games, transition games, zone games with or without an opponent, game situations, and small-sided games.