This course has several objectives, and its main goal is to introduce the mandatory knowledge for a good understanding of Chemistry of the Solid State, with a focus on chemistry of (Nano) materials, and more specifically a first approach of material design for nanomaterials. The main contents of this course include: crystal structures and bonding in solids; introduction to diffraction, solid state synthesis, and thermal analysis techniques employed in the study of materials; defects, non-stoichiometry, and solid solutions; phase diagrams for solid systems. As a result, along this course, a continuous emphasis will be provided on the identification of descriptors at any steps of the scientific process, descriptors being defined as descriptive parameters that inform quantitatively on a structure or mechanism.