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In this manuscript I review the mathematics and physics that underpins recentwork using the clustering of galaxies to derive cosmological model constraints.I start by describing the basic concepts, and gradually move on to some of thecomplexities involved in analysing galaxy redshift surveys, focusing on the 2dFGalaxy Redshift Survey (2dFGRS) and the Sloan Digital Sky survey (SDSS).Difficulties within such an analysis, particularly dealing with redshift spacedistortions and galaxy bias are highlighted. I then describe currentobservations of the CMB fluctuation power spectrum, and consider the importanceof measurements of the clustering of galaxies in light of recent experiments.Finally, I provide an example joint analysis of the latest CMB and large-scalestructure data, leading to a set of parameter constraints.Comment: 30 pages, 13 figures. Lecture given at Third Aegean Summer School,  The invisible universe: Dark matter and Dark energ

Cosmological Constraints from Galaxy Clustering