The Modave Summer School in Mathematical Physics is a yearly summer school organised by and aimed at Ph.D. students. The school provides blackboard lectures given by young researchers. The lectures cover core subjects that contribute to the backbone knowledge of the participants working in the field of theoretical and mathematical physics, with a special focus on topics in General Relativity, Quantum Field Theory and String Theory. This year marks the 22nd edition of the school! As for the previous years, the ULB, VUB, KUL, UGENT and UMONS will join their forces to propose a unique scientific and human experience in the heart of the Belgian countryside.