To gain a solid understanding of optical clocks, frequency combs, atom trapping, and atom interferometry, a foundational knowledge in quantum optics is essential. A recommended resource is "Introduction to Quantum Optics" by Grynberg, Aspect, and Fabre, which provides a comprehensive introduction to quantum optics and covers recent developments in the field. While "Laser Control of Atoms and Molecules" by V.S. Lethokov was suggested, it received criticism for being more of a review article than a thorough explanation of concepts. For frequency combs, the paper "Phase stabilization of ultrashort optical pulses" by S. T. Cundiff is noted for its introductory content, though it may reference older systems. Overall, focusing on recent publications will be beneficial due to the evolving nature of these topics.