The document discusses key aspects of isometric sketches. It notes that isometric axes intersect at 120 degree angles. Isometric lines are parallel to these axes while non-isometric lines are not. The offset location measurement method uses parallelism to locate points and can draw normal, inclined, and oblique surfaces. True or false questions clarify that triangle angles do not directly transfer to isometrics and hidden lines/centerlines are used sparingly if at all in isometric drawings.