This lecture, presented by the instructor Olivier Burdet from EPFL, focuses on understanding the functioning of structures such as beams, slabs, and frames through the use of graphic statics. Starting from the basics covered in Structural Art 1, the course extends the knowledge to the resolution of structures composed of triangulated bars. It covers the design of elements, the behavior of beams combining tension and compression zones, the functioning and pre-dimensioning of slabs, and the principles of stability in compressed structures. By the end of the course, students will be able to comprehend existing load-bearing structures and design new ones, making it suitable for civil engineering and architecture students as well as anyone interested in structural behavior.