Explore the first lecture in a series on integrability in planar AdS/CFT, Yangian symmetry, and applications delivered by Niklas Beisert from ETH Zurich at the International Centre for Theoretical Sciences. Delve into the AdS/CFT correspondence, N=4 supersymmetric Yang-Mills theory, and the planar limit. Examine the connection between gauge theory and spin chains, the Bethe ansatz, scattering and symmetry, and the thermodynamic Bethe ansatz. Investigate planar scattering in gauge and string theory, null polygonal Wilson loops, and dual conformal and Yangian symmetries. Gain insights into the underlying quantum algebra of integrability in the context of the AdS/CFT correspondence and its applications to scattering amplitudes, correlation functions, and Wilson loops.