Why The Smith chart is a graphical calculator whose coordinates are the normalized resistance and reactance circles of a transmission line, so it lets you plot a complex impedance and rotate it along constant-SWR circles to see how impedance transforms with line length. That makes it a tool for solving transmission line problems: finding the impedance seen at the input of a line, designing matching networks, and reading SWR directly as the radius of the plotted circle. Everything on the chart is about impedance, reflection coefficient and SWR.
Watch out Beam headings and satellite azimuth/elevation come from great-circle or orbital calculations, and propagation reliability versus frequency comes from HF prediction software; none of those use the resistance/reactance coordinate system that defines the Smith chart.
Smith chart = impedance chart. Circles of R and arcs of X, with SWR read off the circle radius.