  Line intensity mapping (LIM) is an emerging technique in measuring galaxy
evolution and the large-scale structure of the universe. LIM surveys measure
the cumulative emission from all galaxies emitting a given line at a particular
redshift, which trace the distribution of dark matter throughout the universe.
In this proceeding, we provide an introduction to LIM modeling, focusing on
power spectrum calculation. Beyond these calculations, we describe how these
power spectra may be used to constrain properties of galaxy evolution and
large-scale structure cosmology. Throughout, we use the anticipated EXCLAIM
signal of ionized carbon ([CII]) at redshift $z=3$ as a case study. Our goal is
to provide a starting point to non-experts, e.g. upper-level undergraduate and
graduate students familiar with the basics of cosmology, with the tools
necessary to understand the literature and generate LIM power spectrum models
themselves, while also describing a wide array of literature for continued
studies.
