This lecture covers the principles of liquid chromatography, focusing on factors affecting resolution, capacity, and asymmetric peaks. It also delves into various chromatographic techniques such as adsorption, reversed-phase, ion exchange, and affinity chromatography. The instructor explains the use of high-performance liquid chromatography (HPLC) and its components, detectors, and different setups. Additionally, the lecture discusses immobilized metal affinity chromatography (IMAC) and the advantages of capillary and nano-LC. The comparison between off-gel isoelectric focusing (IEF) and strong cation exchange (SCX) chromatography is explored, highlighting their complementarities for in-depth proteome coverage.