The School-Workshop will represent Quantum Rings as a special class of modern high-tech materials structures at the nanoscale. We will deal with their formation by molecular beam epitaxy and droplet epitaxy of semiconductors, their topology-driven electronic, optical, and magnetic properties. Highly complex theoretical models will be discussed which have been developed to adequately explain the specific features of Quantum Rings. We will specially emphasize development of low-cost high-performance electronic, spintronic, magnetic, optoelectronic and information processing devices based on various doubly-connected structures.