Explore the fascinating world of quantum machines built with light in this comprehensive lecture, the first of a five-part series delivered by Marcelo Martinelli from IFUSP – USP, Brazil. Delve into the fundamental concepts and cutting-edge techniques used to harness light for quantum applications. Learn about the intricate relationship between light and cold atoms, and discover how these principles are applied in the development of advanced quantum technologies. Gain valuable insights from this expert-led session, part of the ICTP-SAIFR School on Light and Cold Atoms held in March 2023. Enhance your understanding of quantum physics and its practical applications in this engaging 1-hour and 24-minute presentation.