The first several options aren't very interesting and won't change much, so I'll explain them now:
Control Mode: Allows switching between a Parameter Editor and a Script Editor. For now, scripting freestyle is new to me too so we'll stick to the Parameter Editor
View Map Cache: This saves the geometry data needed to compute the outlines into a cache, which speeds up performance when the geometry hasn't changed. This is good to turn on when just messing with line styles and settings, as it speeds up performance after the first render
As Render Pass: Renders freestyle to a separate render pass to be tinkered with in the Compositor. This will be used later, but for now leave it off.
Crease Angle: This changes the angle cutoff for how sharp or smooth something needs to be to be recognized as a line. With an angle of 180°, freestyle acts as a wireframe outline, highlighting every edge: